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rest
noun
a
period
of
relaxing
or
sleeping
when
you
are
not
working
or
moving
•
After
three
hours
of
driving
,
the
family
took
a
short
rest
at
a
roadside
café
.
After
three
hours
of
driving
,
the
family
took
a
short
rest
at
a
roadside
café
.
•
You
should
get
plenty
of
rest
before
your
big
exam
tomorrow
.
You
should
get
plenty
of
rest
before
your
big
exam
tomorrow
.
noun
a
period
of
sleep
or
relaxation
that
allows
you
to
recover
energy
•
After
the
long
hike
,
Maya
lay
down
for
a
short
rest
on
the
sofa
.
After
the
long
hike
,
Maya
lay
down
for
a
short
rest
on
the
sofa
.
•
Doctors
say
getting
enough
rest
is
essential
for
good
health
.
Doctors
say
getting
enough
rest
is
essential
for
good
health
.
verb
to
relax
or
sleep
so
you
get
back
your
energy
•
After
a
long
hike
,
we
rested
under
a
shady
tree
.
After
a
long
hike
,
we
rested
under
a
shady
tree
.
•
The
doctor
told
her
to
rest
for
a
few
days
after
the
flu
.
The
doctor
told
her
to
rest
for
a
few
days
after
the
flu
.
noun
the
people
or
things
that
remain
after
others
have
been
taken
or
mentioned
•
You
can
keep
one
cookie
,
and
I'll
have
the
rest
.
You
can
keep
one
cookie
,
and
I'll
have
the
rest
.
•
Sarah
finished
her
homework
;
the
rest
of
the
class
was
still
working
.
Sarah
finished
her
homework
;
the
rest
of
the
class
was
still
working
.
verb
to
place
something
gently
on
or
against
something
so
that
it
is
supported
•
She
rested
her
head
on
his
shoulder
during
the
movie
.
She
rested
her
head
on
his
shoulder
during
the
movie
.
•
The
ladder
rests
against
the
wall
so
we
can
paint
the
ceiling
.
The
ladder
rests
against
the
wall
so
we
can
paint
the
ceiling
.
restaurant
noun
A
place
where
people
pay
to
have
meals
cooked
and
served
to
them
.
•
After
the
movie
,
we
decided
to
eat
at
the
new
Italian
restaurant
downtown
.
After
the
movie
,
we
decided
to
eat
at
the
new
Italian
restaurant
downtown
.
•
She
works
as
a
chef
in
a
five-star
restaurant
overlooking
the
sea
.
She
works
as
a
chef
in
a
five-star
restaurant
overlooking
the
sea
.
Borrowed
into
English
in
the
early
19th
century
from
French
“
restaurant
,”
originally
the
present
participle
of
“
restaurer
,”
meaning
“
to
restore
,”
because
the
broth
served
in
early
Paris
eateries
was
said
to
restore
health
.
restore
verb
-
restore
,
restoring
,
restores
,
restored
to
repair
or
clean
something
so
that
it
looks
or
works
like
it
did
when
it
was
new
•
A
team
of
experts
carefully
restore
the
ancient
mural
,
revealing
its
bright
original
colors
.
A
team
of
experts
carefully
restore
the
ancient
mural
,
revealing
its
bright
original
colors
.
•
The
mechanic
promised
to
restore
the
vintage
motorcycle
to
working
order
by
summer
.
The
mechanic
promised
to
restore
the
vintage
motorcycle
to
working
order
by
summer
.
Borrowed
from
Latin
“
restaurare
”
meaning
“
to
rebuild
or
renew
.”
verb
-
restore
,
restoring
,
restores
,
restored
to
make
a
situation
,
feeling
,
or
system
exist
again
after
it
disappeared
or
was
lost
•
Extra
police
were
deployed
to
restore
order
after
the
protest
turned
chaotic
.
Extra
police
were
deployed
to
restore
order
after
the
protest
turned
chaotic
.
•
The
apology
helped
restore
trust
between
the
two
longtime
friends
.
The
apology
helped
restore
trust
between
the
two
longtime
friends
.
verb
-
restore
,
restoring
,
restores
,
restored
to
give
something
back
to
the
person
,
place
,
or
condition
it
rightfully
belongs
to
•
The
museum
agreed
to
restore
the
stolen
sculpture
to
its
original
owners
.
The
museum
agreed
to
restore
the
stolen
sculpture
to
its
original
owners
.
•
The
new
policy
will
restore
land
to
the
indigenous
community
.
The
new
policy
will
restore
land
to
the
indigenous
community
.
noun
an
operation
that
copies
computer
data
back
from
a
backup
so
it
can
be
used
again
•
After
the
crash
,
the
IT
team
performed
a
restore
to
recover
last
night's
files
.
After
the
crash
,
the
IT
team
performed
a
restore
to
recover
last
night's
files
.
•
Running
a
full
restore
may
take
several
hours
,
depending
on
the
size
of
the
database
.
Running
a
full
restore
may
take
several
hours
,
depending
on
the
size
of
the
database
.
restriction
noun
a
rule
or
condition
that
limits
what
people
can
do
•
New
water
restrictions
were
imposed
during
the
drought
.
New
water
restrictions
were
imposed
during
the
drought
.
•
The
park
has
a
noise
restriction
that
bans
loud
music
after
9
p
.
m
.
The
park
has
a
noise
restriction
that
bans
loud
music
after
9
p
.
m
.
From
Latin
‘
restrictio
’
meaning
‘
a
binding
back
’
or
‘
confinement
’.
noun
-
restriction
the
act
of
limiting
something
or
the
state
of
being
limited
•
Calorie
restriction
can
improve
some
people
’
s
health
.
Calorie
restriction
can
improve
some
people
’
s
health
.
•
Constant
restriction
of
information
often
leads
to
rumors
.
Constant
restriction
of
information
often
leads
to
rumors
.
From
Latin
‘
restrictio
’,
later
used
in
English
to
mean
‘
the
action
of
limiting
’.
sure
adjective
-
sure
,
surer
,
surest
feeling
certain
that
something
is
true
or
will
happen
•
I'm
sure
we'll
catch
the
bus
if
we
leave
now
.
I'm
sure
we'll
catch
the
bus
if
we
leave
now
.
•
Are
you
sure
this
is
the
right
key
?
Are
you
sure
this
is
the
right
key
?
from
Old
French
“
seur
”,
from
Latin
“
securus
”
meaning
‘
safe
,
free
from
care
’
adjective
-
sure
,
surer
,
surest
completely
certain
that
something
is
true
,
correct
,
or
will
happen
•
I'm
sure
this
is
the
right
key
for
the
front
door
.
I'm
sure
this
is
the
right
key
for
the
front
door
.
•
The
coach
sounded
sure
about
our
chances
of
winning
.
The
coach
sounded
sure
about
our
chances
of
winning
.
Middle
English
,
from
Old
French
sur
“
safe
,
secure
,”
from
Latin
securus
“
free
from
care
.”
adjective
-
sure
,
surer
,
surest
guaranteed
to
happen
or
succeed
;
impossible
to
fail
•
Missing
practice
is
a
sure
way
to
lose
the
game
.
Missing
practice
is
a
sure
way
to
lose
the
game
.
•
Dark
clouds
are
a
sure
sign
of
rain
.
Dark
clouds
are
a
sure
sign
of
rain
.
adjective
-
sure
,
surer
,
surest
guaranteed
to
happen
or
succeed
;
inevitable
•
A
rainy
day
is
a
sure
way
to
ruin
a
picnic
.
A
rainy
day
is
a
sure
way
to
ruin
a
picnic
.
•
Studying
every
day
is
the
sure
path
to
passing
the
exam
.
Studying
every
day
is
the
sure
path
to
passing
the
exam
.
Extension
of
the
core
meaning
“
certain
”
to
describe
things
that
unavoidably
lead
to
a
result
.
interest
noun
a
feeling
of
wanting
to
know
more
about
something
or
to
keep
paying
attention
to
it
•
The
science
show
sparked
the
students'
interest
in
space
.
The
science
show
sparked
the
students'
interest
in
space
.
•
Maria
lost
all
interest
in
the
movie
and
started
looking
at
her
phone
.
Maria
lost
all
interest
in
the
movie
and
started
looking
at
her
phone
.
From
Middle
English
‘
interest
’,
from
Medieval
Latin
‘
interest
’
meaning
‘
it
is
of
importance
’.
noun
an
activity
,
subject
,
or
hobby
that
you
enjoy
and
like
to
spend
time
on
•
Coin
collecting
is
Tom's
newest
interest
.
Coin
collecting
is
Tom's
newest
interest
.
•
She
shares
an
interest
in
photography
with
her
father
.
She
shares
an
interest
in
photography
with
her
father
.
noun
money
that
you
pay
for
borrowing
money
or
that
a
bank
pays
you
for
keeping
money
there
•
The
bank
pays
3%
interest
on
savings
accounts
.
The
bank
pays
3%
interest
on
savings
accounts
.
•
Because
he
missed
a
payment
,
the
interest
on
his
loan
went
up
.
Because
he
missed
a
payment
,
the
interest
on
his
loan
went
up
.
Sense
developed
in
17th-century
English
from
the
idea
of
‘
share
,
concern
’
to
a
fee
paid
for
the
use
of
money
.
verb
-
interest
,
interesting
,
interests
,
interested
to
make
someone
want
to
know
more
about
something
•
The
colorful
poster
interested
the
kids
in
the
museum
exhibit
.
The
colorful
poster
interested
the
kids
in
the
museum
exhibit
.
•
Stories
about
space
always
interest
him
.
Stories
about
space
always
interest
him
.
noun
a
share
,
advantage
,
or
right
that
a
person
or
group
has
in
something
and
wants
to
protect
•
He
sold
his
interest
in
the
restaurant
to
start
a
new
company
.
He
sold
his
interest
in
the
restaurant
to
start
a
new
company
.
•
Parents
have
a
strong
interest
in
their
children's
safety
at
school
.
Parents
have
a
strong
interest
in
their
children's
safety
at
school
.
clear
adjective
-
clear
,
clearer
,
clearest
easy
to
understand
,
obvious
,
or
not
confusing
•
Her
explanation
was
so
clear
that
everyone
understood
.
Her
explanation
was
so
clear
that
everyone
understood
.
•
Use
short
,
clear
sentences
in
your
report
.
Use
short
,
clear
sentences
in
your
report
.
From
Middle
English
cler
,
from
Old
French
cler
,
from
Latin
clarus
“
bright
,
distinct
,
clear
.”
adjective
-
clear
,
clearer
,
clearest
easy
to
understand
,
see
,
or
hear
,
and
not
confusing
•
Her
handwriting
is
so
neat
and
clear
that
everyone
can
read
it
.
Her
handwriting
is
so
neat
and
clear
that
everyone
can
read
it
.
•
Please
give
clear
instructions
so
we
don't
get
lost
.
Please
give
clear
instructions
so
we
don't
get
lost
.
adjective
-
clear
,
clearer
,
clearest
transparent
;
able
to
be
seen
through
easily
•
The
lake
water
was
so
clear
that
we
could
see
the
rocks
below
.
The
lake
water
was
so
clear
that
we
could
see
the
rocks
below
.
•
Use
a
clear
glass
bowl
so
everyone
can
see
the
salad
layers
.
Use
a
clear
glass
bowl
so
everyone
can
see
the
salad
layers
.
adjective
-
clear
,
clearer
,
clearest
able
to
be
seen
through
;
transparent
or
not
cloudy
•
The
water
in
the
mountain
stream
was
perfectly
clear
.
The
water
in
the
mountain
stream
was
perfectly
clear
.
•
She
chose
a
vase
made
of
clear
glass
.
She
chose
a
vase
made
of
clear
glass
.
Same
origin
as
Sense
1
.
poor
adjective
-
poor
,
poorer
,
poorest
not
having
enough
money
to
live
comfortably
or
meet
basic
needs
•
Her
family
was
so
poor
that
they
sometimes
had
only
bread
for
dinner
.
Her
family
was
so
poor
that
they
sometimes
had
only
bread
for
dinner
.
•
Many
poor
farmers
cannot
afford
modern
equipment
.
Many
poor
farmers
cannot
afford
modern
equipment
.
From
Old
French
“
povre
”,
from
Latin
“
pauper
”
meaning
‘
poor
,
scanty
’.
adjective
-
poor
,
poorer
,
poorest
deserving
sympathy
because
of
suffering
or
misfortune
•
That
poor
puppy
looks
lost
.
That
poor
puppy
looks
lost
.
•
The
poor
man
slipped
on
the
ice
and
broke
his
arm
.
The
poor
man
slipped
on
the
ice
and
broke
his
arm
.
adjective
-
poor
,
poorer
,
poorest
of
low
quality
or
below
the
expected
standard
•
The
restaurant
was
expensive
,
but
the
food
was
surprisingly
poor
.
The
restaurant
was
expensive
,
but
the
food
was
surprisingly
poor
.
•
The
team
played
a
poor
game
and
lost
three-nil
.
The
team
played
a
poor
game
and
lost
three-nil
.
adjective
-
poor
,
poorer
,
poorest
not
good
at
something
;
lacking
skill
•
I
’
m
poor
at
remembering
names
.
I
’
m
poor
at
remembering
names
.
•
She
is
a
poor
swimmer
,
so
she
stays
in
the
shallow
end
.
She
is
a
poor
swimmer
,
so
she
stays
in
the
shallow
end
.
adjective
-
poor
,
poorer
,
poorest
lacking
or
having
very
little
of
a
particular
quality
,
substance
,
or
resource
•
Desert
soil
is
poor
in
organic
matter
.
Desert
soil
is
poor
in
organic
matter
.
•
This
diet
is
poor
in
iron
and
can
cause
anemia
.
This
diet
is
poor
in
iron
and
can
cause
anemia
.
near
adverb
-
near
,
nearer
,
nearest
close
to
someone
or
something
;
not
far
away
;
almost
•
The
baby
started
crying
when
the
dog
came
too
near
.
The
baby
started
crying
when
the
dog
came
too
near
.
•
It
’
s
getting
near
midnight
,
so
we
should
head
home
.
It
’
s
getting
near
midnight
,
so
we
should
head
home
.
adjective
-
near
,
nearer
,
nearest
close
in
distance
or
time
•
Our
hotel
is
the
near
building
with
the
blue
roof
.
Our
hotel
is
the
near
building
with
the
blue
roof
.
•
The
deadline
is
getting
near
,
so
we
must
finish
the
project
.
The
deadline
is
getting
near
,
so
we
must
finish
the
project
.
interesting
adjective
holding
attention
because
it
is
unusual
,
exciting
,
or
gives
new
information
.
•
The
museum
had
an
interesting
exhibit
about
ancient
Egypt
.
The
museum
had
an
interesting
exhibit
about
ancient
Egypt
.
•
He
always
tells
interesting
stories
around
the
campfire
.
He
always
tells
interesting
stories
around
the
campfire
.
adjective
used
politely
or
ironically
to
say
something
is
unusual
,
strange
,
or
perhaps
not
good
.
•
That's
an
interesting
outfit
—
you
don't
see
neon
green
with
purple
polka
dots
every
day
.
That's
an
interesting
outfit
—
you
don't
see
neon
green
with
purple
polka
dots
every
day
.
•
Well
,
this
is
interesting
,
the
printer
just
started
smoking
.
Well
,
this
is
interesting
,
the
printer
just
started
smoking
.
interested
adjective
wanting
to
know
more
about
someone
or
something
,
or
wanting
to
take
part
in
it
•
Maria
is
very
interested
in
dinosaurs
and
loves
reading
about
them
.
Maria
is
very
interested
in
dinosaurs
and
loves
reading
about
them
.
•
If
you
are
interested
,
you
can
join
our
science
club
after
school
.
If
you
are
interested
,
you
can
join
our
science
club
after
school
.
adjective
having
a
personal
advantage
or
stake
in
something
,
so
not
completely
neutral
or
fair
•
An
interested
witness
might
exaggerate
to
protect
a
friend
.
An
interested
witness
might
exaggerate
to
protect
a
friend
.
•
Because
her
company
could
win
the
contract
,
she
is
an
interested
party
in
the
decision
.
Because
her
company
could
win
the
contract
,
she
is
an
interested
party
in
the
decision
.
fair
adjective
-
fair
,
fairer
,
fairest
bright
and
dry
,
without
rain
or
storms
•
The
forecast
says
we
will
have
fair
weather
all
weekend
.
The
forecast
says
we
will
have
fair
weather
all
weekend
.
•
Sailors
prefer
to
leave
port
when
the
sea
is
calm
and
the
sky
is
fair
.
Sailors
prefer
to
leave
port
when
the
sea
is
calm
and
the
sky
is
fair
.
Weather
sense
recorded
since
the
14th
century
,
linked
to
the
idea
of
pleasantness
and
brightness
.
adjective
-
fair
,
fairer
,
fairest
treating
everyone
equally
and
honestly
,
without
favoritism
or
cheating
•
The
referee
tried
to
be
fair
to
both
teams
during
the
match
.
The
referee
tried
to
be
fair
to
both
teams
during
the
match
.
•
She
divided
the
candy
in
a
fair
way
so
each
child
got
the
same
number
of
pieces
.
She
divided
the
candy
in
a
fair
way
so
each
child
got
the
same
number
of
pieces
.
Old
English
fæger
“
beautiful
,
pleasant
,
pleasing
,”
later
“
just
,
equitable
.”
adjective
-
fair
,
fairer
,
fairest
having
light
skin
or
light-colored
hair
•
His
twin
sister
has
fair
hair
and
freckles
.
His
twin
sister
has
fair
hair
and
freckles
.
•
People
with
fair
skin
should
use
strong
sunscreen
in
summer
.
People
with
fair
skin
should
use
strong
sunscreen
in
summer
.
Sense
of
“
light-colored
”
developed
in
Middle
English
from
the
idea
of
brightness
and
beauty
.
adjective
-
fair
,
fairer
,
fairest
quite
good
or
acceptable
but
not
excellent
•
The
hotel
offers
fair
service
for
a
low
price
.
The
hotel
offers
fair
service
for
a
low
price
.
•
She
has
a
fair
chance
of
winning
the
scholarship
.
She
has
a
fair
chance
of
winning
the
scholarship
.
Meaning
“
moderately
good
”
appears
in
the
16th
century
,
extending
from
earlier
senses
of
balance
and
adequacy
.
forest
noun
a
large
area
of
land
that
is
thickly
covered
with
trees
and
other
plants
•
The
hikers
set
up
camp
deep
in
the
forest
.
The
hikers
set
up
camp
deep
in
the
forest
.
•
A
family
of
deer
darted
between
the
tall
pines
in
the
forest
.
A
family
of
deer
darted
between
the
tall
pines
in
the
forest
.
From
Old
French
‘
forest
’,
from
Medieval
Latin
‘
foresta
’,
originally
meaning
an
unenclosed
woodland
reserved
for
hunting
.
verb
to
plant
trees
on
an
area
of
land
so
that
it
becomes
a
forest
•
Environmental
groups
plan
to
forest
the
barren
hillside
next
spring
.
Environmental
groups
plan
to
forest
the
barren
hillside
next
spring
.
•
The
government
pledged
funds
to
forest
the
desert
fringe
.
The
government
pledged
funds
to
forest
the
desert
fringe
.
Back-formation
from
the
noun
‘
forest
’,
first
recorded
in
the
17th
century
.
arrest
verb
to
take
someone
suspected
of
a
crime
into
legal
custody
•
Two
officers
arrested
the
driver
for
speeding
and
drunk
driving
.
Two
officers
arrested
the
driver
for
speeding
and
drunk
driving
.
•
If
the
detectives
find
more
evidence
,
they
will
arrest
the
suspect
tomorrow
.
If
the
detectives
find
more
evidence
,
they
will
arrest
the
suspect
tomorrow
.
from
Old
French
"
arester
" (
to
stop
,
restrain
),
from
Latin
"
arrestare
" (
to
stop
)
noun
the
act
of
taking
someone
into
police
custody
•
The
quick
arrest
of
the
robber
surprised
the
neighbors
.
The
quick
arrest
of
the
robber
surprised
the
neighbors
.
•
After
his
arrest
,
he
was
taken
to
the
city
jail
.
After
his
arrest
,
he
was
taken
to
the
city
jail
.
verb
-
arrest
,
arresting
,
arrests
,
arrested
to
take
someone
into
police
custody
because
the
authorities
believe
that
person
has
broken
the
law
•
Two
officers
arrest
the
burglar
as
he
tries
to
climb
out
the
window
.
Two
officers
arrest
the
burglar
as
he
tries
to
climb
out
the
window
.
•
After
examining
the
evidence
,
detectives
decided
to
arrest
the
chief
suspect
at
dawn
.
After
examining
the
evidence
,
detectives
decided
to
arrest
the
chief
suspect
at
dawn
.
From
Old
French
arester
(
to
stop
,
stay
)
and
Latin
ad-
+
restāre
(
to
remain
).
noun
the
act
of
taking
someone
into
police
custody
•
The
suspect
’
s
arrest
was
announced
on
the
evening
news
.
The
suspect
’
s
arrest
was
announced
on
the
evening
news
.
•
Witnesses
cheered
during
the
dramatic
arrest
in
the
town
square
.
Witnesses
cheered
during
the
dramatic
arrest
in
the
town
square
.
verb
to
stop
something
from
continuing
or
developing
,
especially
something
harmful
•
Early
treatment
can
arrest
the
spread
of
the
infection
.
Early
treatment
can
arrest
the
spread
of
the
infection
.
•
The
firefighter
sprayed
foam
to
arrest
the
flames
.
The
firefighter
sprayed
foam
to
arrest
the
flames
.
verb
to
attract
and
hold
someone
’
s
attention
completely
•
The
vivid
mural
arrested
every
passer-by
’
s
gaze
.
The
vivid
mural
arrested
every
passer-by
’
s
gaze
.
•
Her
haunting
violin
solo
arrested
the
audience
in
complete
silence
.
Her
haunting
violin
solo
arrested
the
audience
in
complete
silence
.
verb
-
arrest
,
arresting
,
arrests
,
arrested
to
stop
the
progress
or
development
of
something
•
Doctors
managed
to
arrest
the
spread
of
the
infection
with
early
treatment
.
Doctors
managed
to
arrest
the
spread
of
the
infection
with
early
treatment
.
•
Strong
measures
are
needed
to
arrest
climate
change
.
Strong
measures
are
needed
to
arrest
climate
change
.
noun
a
sudden
stopping
of
a
bodily
function
or
other
process
,
especially
the
beating
of
the
heart
•
The
swimmer
suffered
cardiac arrest
but
was
revived
by
lifeguards
.
The
swimmer
suffered
cardiac arrest
but
was
revived
by
lifeguards
.
•
Rapid
cooling
can
cause
respiratory
arrest
in
newborn
animals
.
Rapid
cooling
can
cause
respiratory
arrest
in
newborn
animals
.
verb
-
arrest
,
arresting
,
arrests
,
arrested
to
attract
and
hold
someone
’
s
attention
•
The
vivid
colors
of
the
sunset
arrest
everyone
’
s
gaze
on
the
beach
.
The
vivid
colors
of
the
sunset
arrest
everyone
’
s
gaze
on
the
beach
.
•
Her
unexpected
question
arrest
the
lecturer
’
s
flow
mid-sentence
.
Her
unexpected
question
arrest
the
lecturer
’
s
flow
mid-sentence
.
rare
adjective
-
rare
,
rarer
,
rarest
not
happening
,
seen
,
or
found
very
often
•
Finding
a
four-leaf
clover
is
rare
,
so
people
believe
it
brings
good
luck
.
Finding
a
four-leaf
clover
is
rare
,
so
people
believe
it
brings
good
luck
.
•
It's
rare
to
see
snow
covering
the
palm
trees
of
this
desert
city
.
It's
rare
to
see
snow
covering
the
palm
trees
of
this
desert
city
.
From
Latin
‘
rarus
’
meaning
‘
thinly
sown
,
uncommon
’.
adjective
-
rare
,
rarer
,
rarest
(
of
meat
)
cooked
for
only
a
short
time
so
the
inside
remains
red
and
juicy
•
Mark
ordered
his
steak
rare
at
the
fancy
restaurant
.
Mark
ordered
his
steak
rare
at
the
fancy
restaurant
.
•
She
prefers
her
burgers
rare
,
still
pink
in
the
middle
.
She
prefers
her
burgers
rare
,
still
pink
in
the
middle
.
Adapts
the
general
sense
of
‘
rare
’
to
cooking
in
the
19th
century
,
referring
to
meat
not
fully
cooked
.
adjective
-
rare
,
rarer
,
rarest
(
of
air
or
gas
)
thin
;
having
low
density
•
At
high
altitudes
,
the
air
becomes
rare
,
making
breathing
harder
.
At
high
altitudes
,
the
air
becomes
rare
,
making
breathing
harder
.
•
Scientists
examine
how
sound
travels
through
rare
gases
in
space
simulations
.
Scientists
examine
how
sound
travels
through
rare
gases
in
space
simulations
.
From
the
same
Latin
root
‘
rarus
’,
originally
meaning
‘
thinly
sown
’,
applied
to
physical
density
in
early
scientific
writing
.
pure
adjective
-
pure
,
purer
,
purest
not
mixed
with
anything
else
;
clean
and
uncontaminated
•
The
hikers
drank
pure
water
from
a
crystal-clear
mountain
spring
.
The
hikers
drank
pure
water
from
a
crystal-clear
mountain
spring
.
•
Use
pure
olive
oil
for
the
salad
dressing
to
get
the
best
flavor
.
Use
pure
olive
oil
for
the
salad
dressing
to
get
the
best
flavor
.
adjective
-
pure
,
purer
,
purest
morally
good
and
innocent
;
free
from
wrongdoing
•
Everyone
admired
the
monk
’
s
pure
heart
and
gentle
words
.
Everyone
admired
the
monk
’
s
pure
heart
and
gentle
words
.
•
The
children
’
s
laughter
was
a
pure
sound
of
joy
.
The
children
’
s
laughter
was
a
pure
sound
of
joy
.
adjective
-
pure
,
purer
,
purest
complete
or
total
,
with
nothing
else
involved
•
It
was
pure
luck
that
we
caught
the
last
train
.
It
was
pure
luck
that
we
caught
the
last
train
.
•
The
match
was
pure
excitement
from
start
to
finish
.
The
match
was
pure
excitement
from
start
to
finish
.
adjective
-
pure
,
purer
,
purest
concerned
only
with
theory
or
ideas
and
not
practical
use
•
He
prefers
pure
mathematics
to
applied
math
.
He
prefers
pure
mathematics
to
applied
math
.
•
Their
research
focuses
on
pure
science
rather
than
inventions
.
Their
research
focuses
on
pure
science
rather
than
inventions
.
adjective
-
pure
,
purer
,
purest
having
a
single
,
unmixed
hue
;
free
from
other
colors
•
The
artist
chose
a
pure
red
for
the
background
.
The
artist
chose
a
pure
red
for
the
background
.
•
Pure
yellow
can
be
hard
on
the
eyes
if
overused
.
Pure
yellow
can
be
hard
on
the
eyes
if
overused
.
severe
adjective
-
severe
,
severer
,
severest
Very
serious
or
extreme
;
causing
a
lot
of
harm
,
pain
,
or
difficulty
.
•
Last
night's
storm
caused
severe
damage
to
the
coastal
village
.
Last
night's
storm
caused
severe
damage
to
the
coastal
village
.
•
She
went
to
hospital
because
of
severe
stomach
pain
.
She
went
to
hospital
because
of
severe
stomach
pain
.
adjective
-
severe
,
severer
,
severest
Strict
and
harsh
in
attitude
,
judgment
,
or
punishment
.
•
The
principal
gave
the
students
a
severe
warning
for
cheating
.
The
principal
gave
the
students
a
severe
warning
for
cheating
.
•
His
father
was
known
to
be
severe
but
fair
.
His
father
was
known
to
be
severe
but
fair
.
adjective
-
severe
,
severer
,
severest
Plain
and
simple
,
without
decoration
,
softness
,
or
excess
.
•
She
chose
a
severe
black
dress
with
no
embellishments
.
She
chose
a
severe
black
dress
with
no
embellishments
.
•
The
office's
severe
design
featured
bare
concrete
walls
and
metal
furniture
.
The
office's
severe
design
featured
bare
concrete
walls
and
metal
furniture
.
square
noun
-
square
,
squaring
,
squares
,
squared
,
squarer
,
squarest
a
flat
shape
with
four
equal
sides
and
four
right
angles
•
The
children
drew
a
big
blue
square
on
the
sidewalk
with
chalk
.
The
children
drew
a
big
blue
square
on
the
sidewalk
with
chalk
.
•
Fold
the
paper
into
a
square
before
you
make
the
origami
crane
.
Fold
the
paper
into
a
square
before
you
make
the
origami
crane
.
From
Old
French
"
esquarre
"
meaning
a
tool
for
measuring
right
angles
,
later
extended
to
the
shape
.
noun
-
square
,
squaring
,
squares
,
squared
,
squarer
,
squarest
an
open
,
usually
paved
area
in
a
town
or
city
where
people
gather
,
often
surrounded
by
buildings
and
roads
•
The
band
played
in
the
town
square
during
the
summer
festival
.
The
band
played
in
the
town
square
during
the
summer
festival
.
•
We
met
at
Trafalgar
Square
before
visiting
the
art
gallery
.
We
met
at
Trafalgar
Square
before
visiting
the
art
gallery
.
Extension
of
the
geometric
sense
,
referring
to
a
space
whose
roughly
square
layout
was
common
in
medieval
towns
.
adjective
-
square
,
squaring
,
squares
,
squared
,
squarer
,
squarest
having
four
equal
sides
and
four
right
angles
,
or
shaped
like
a
square
•
They
sat
around
a
large
square
table
in
the
conference
room
.
They
sat
around
a
large
square
table
in
the
conference
room
.
•
The
gift
was
wrapped
in
a
tiny
square
box
tied
with
a
red
ribbon
.
The
gift
was
wrapped
in
a
tiny
square
box
tied
with
a
red
ribbon
.
Directly
from
the
noun
“
square
”,
used
as
an
adjective
by
the
14th
century
.
adjective
-
square
,
squaring
,
squares
,
squared
,
squarer
,
squarest
(
informal
)
not
fashionable
or
modern
;
conventional
in
an
unexciting
way
•
He
felt
square
because
he
didn
’
t
know
any
of
the
new
slang
his
friends
used
.
He
felt
square
because
he
didn
’
t
know
any
of
the
new
slang
his
friends
used
.
•
My
brother
thinks
jazz
records
are
square
,
but
I
love
them
.
My
brother
thinks
jazz
records
are
square
,
but
I
love
them
.
1920s
American
jazz
slang
,
likening
someone
rigid
or
conventional
to
the
regularity
of
a
geometric
square
.
verb
-
square
,
squaring
,
squares
,
squared
,
squarer
,
squarest
to
make
something
even
,
level
,
or
settled
,
especially
to
pay
a
debt
or
make
accounts
correct
•
I
need
to
square
the
bill
with
the
restaurant
before
we
leave
.
I
need
to
square
the
bill
with
the
restaurant
before
we
leave
.
•
The
carpenter
checked
the
frame
and
then
squared
the
corners
with
a
metal
tool
.
The
carpenter
checked
the
frame
and
then
squared
the
corners
with
a
metal
tool
.
From
the
idea
of
bringing
lines
to
a
right
angle
,
extended
in
15th
century
to
balancing
accounts
.
dear
adjective
-
dear
,
dearer
,
dearest
loved
and
valued
very
much
•
Maria
gave
her
dear
friend
a
warm
hug
at
the
airport
.
Maria
gave
her
dear
friend
a
warm
hug
at
the
airport
.
•
He
keeps
a
photo
of
his
dear
grandmother
on
his
desk
.
He
keeps
a
photo
of
his
dear
grandmother
on
his
desk
.
adjective
-
dear
,
dearer
,
dearest
costing
a
lot
of
money
•
Fresh
berries
are
quite
dear
in
winter
.
Fresh
berries
are
quite
dear
in
winter
.
•
The
watch
was
nice
but
too
dear
for
my
budget
.
The
watch
was
nice
but
too
dear
for
my
budget
.
adverb
-
dear
,
dearer
,
dearest
at
a
high
price
;
expensively
•
During
the
shortage
,
farmers
had
to
buy
grain
dear
and
sell
milk
cheap
.
During
the
shortage
,
farmers
had
to
buy
grain
dear
and
sell
milk
cheap
.
•
We
paid
dear
for
a
last-minute
hotel
room
in
the
city
center
.
We
paid
dear
for
a
last-minute
hotel
room
in
the
city
center
.
mere
adjective
-
mere
,
merer
,
merest
used
to
emphasize
how
small
,
unimportant
,
or
limited
something
is
•
It
was
a
mere
scratch
,
but
he
insisted
on
seeing
a
doctor
.
It
was
a
mere
scratch
,
but
he
insisted
on
seeing
a
doctor
.
•
The
mere
thought
of
skydiving
made
his
knees
shake
.
The
mere
thought
of
skydiving
made
his
knees
shake
.
From
Middle
English
mere
,
from
Latin
merus
meaning
‘
undiluted
,
pure
’.
eager
adjective
-
eager
,
eagerer
,
eagerest
very
keen
,
excited
,
and
ready
for
something
to
happen
or
to
do
something
•
The
children
were
eager
to
open
their
birthday
presents
.
The
children
were
eager
to
open
their
birthday
presents
.
•
An
eager
crowd
gathered
outside
the
stadium
hours
before
the
concert
began
.
An
eager
crowd
gathered
outside
the
stadium
hours
before
the
concert
began
.
Old
English
ēgor
and
later
Middle
English
egre
borrowed
from
Old
French
aigre
,
originally
meaning
“
sharp
,
keen
,”
which
evolved
to
the
present
sense
of
keen
desire
.
adjective
-
eager
,
eagerer
,
eagerest
(
archaic
)
sharp
,
biting
,
or
piercing
,
especially
describing
cold
wind
or
air
•
A
bitter
and
eager
wind
swept
across
the
open
fields
.
A
bitter
and
eager
wind
swept
across
the
open
fields
.
•
The
sailors
dreaded
the
eager
air
that
signaled
a
hard
northern
storm
.
The
sailors
dreaded
the
eager
air
that
signaled
a
hard
northern
storm
.
From
Middle
English
sense
of
“
sharp
,
keen
”
inherited
from
Old
French
aigre
;
over
time
this
literal
meaning
faded
while
the
figurative
sense
survived
.