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π
fact
noun
something
that
is
known
or
proven
to
be
true
β’
It
is
a
well-known
fact
that
water
boils
at
100
Β°C
at
sea
level
.
It
is
a
well-known
fact
that
water
boils
at
100
Β°C
at
sea
level
.
β’
The
museum
guide
stated
the
historical
fact
that
the
castle
was
built
in
the
12th
century
.
The
museum
guide
stated
the
historical
fact
that
the
castle
was
built
in
the
12th
century
.
From
Latin
factum
β
a
thing
done
,β
from
facere
β
to
do
,
make
.β
The
sense
shifted
in
English
from
β
deed
β
to
β
something
known
to
be
true
β
in
the
16thβ17th
centuries
.
noun
a
piece
of
accurate
information
or
detail
about
something
β’
The
reporter
gathered
all
the
facts
before
publishing
the
story
.
The
reporter
gathered
all
the
facts
before
publishing
the
story
.
β’
Know
the
facts
about
healthy
eating
before
starting
a
diet
.
Know
the
facts
about
healthy
eating
before
starting
a
diet
.
Same
historical
root
as
the
main
sense
,
from
Latin
factum
;
plural
use
for
collections
of
information
became
common
in
the
19th
century
.
act
noun
something
that
someone
does
β’
Saving
the
puppy
was
a
brave
act
of
kindness
.
Saving
the
puppy
was
a
brave
act
of
kindness
.
β’
One
small
act
can
change
someone
β
s
day
.
One
small
act
can
change
someone
β
s
day
.
verb
-
act
,
acting
,
acts
,
acted
to
do
something
,
especially
in
order
to
deal
with
a
situation
β’
If
you
smell
gas
in
the
kitchen
,
act
immediately
and
open
the
windows
.
If
you
smell
gas
in
the
kitchen
,
act
immediately
and
open
the
windows
.
β’
The
coach
told
the
players
to
act
like
champions
,
even
off
the
field
.
The
coach
told
the
players
to
act
like
champions
,
even
off
the
field
.
From
Latin
actus
β
a
doing
,
action
β,
past
participle
of
agere
β
to
do
,
drive
β.
noun
something
that
someone
does
,
especially
a
single
deed
or
action
β’
Helping
the
elderly
neighbor
was
a
kind
act
.
Helping
the
elderly
neighbor
was
a
kind
act
.
β’
Vandalism
is
an
act
of
disrespect
toward
the
community
.
Vandalism
is
an
act
of
disrespect
toward
the
community
.
From
Latin
actus
β
doing
,
action
β.
verb
-
act
,
acting
,
acts
,
acted
to
do
something
in
order
to
achieve
a
result
or
solve
a
problem
β’
When
the
kitchen
caught
fire
,
Jason
decided
to
act
at
once
and
grabbed
the
extinguisher
.
When
the
kitchen
caught
fire
,
Jason
decided
to
act
at
once
and
grabbed
the
extinguisher
.
β’
Governments
must
act
quickly
to
protect
endangered
animals
.
Governments
must
act
quickly
to
protect
endangered
animals
.
verb
-
act
,
acting
,
acts
,
acted
to
perform
a
role
in
a
play
,
film
,
or
television
show
β’
Emma
loves
to
act
in
school
plays
and
wear
different
costumes
.
Emma
loves
to
act
in
school
plays
and
wear
different
costumes
.
β’
He
dreams
of
moving
to
Hollywood
to
act
in
big
movies
.
He
dreams
of
moving
to
Hollywood
to
act
in
big
movies
.
verb
-
act
,
acting
,
acts
,
acted
to
behave
or
conduct
yourself
in
a
particular
way
β’
Please
act
politely
when
our
guests
arrive
.
Please
act
politely
when
our
guests
arrive
.
β’
He
acted
like
he
didn
β
t
hear
the
question
.
He
acted
like
he
didn
β
t
hear
the
question
.
noun
one
of
the
main
parts
into
which
a
play
,
opera
,
or
ballet
is
divided
β’
After
the
first
act
,
the
audience
went
to
the
lobby
for
refreshments
.
After
the
first
act
,
the
audience
went
to
the
lobby
for
refreshments
.
β’
The
tragedy
has
five
acts
in
total
.
The
tragedy
has
five
acts
in
total
.
noun
behaviour
that
is
not
genuine
but
meant
to
deceive
or
impress
β’
Don
β
t
believe
his
tears
;
it
β
s
just
an
act
.
Don
β
t
believe
his
tears
;
it
β
s
just
an
act
.
β’
She
put
on
an
act
of
bravery
,
but
inside
she
was
scared
.
She
put
on
an
act
of
bravery
,
but
inside
she
was
scared
.
verb
-
act
,
acting
,
acts
,
acted
to
perform
as
an
actor
in
a
play
,
film
,
or
television
show
β’
She
loves
to
act
on
stage
and
dreams
of
Broadway
.
She
loves
to
act
on
stage
and
dreams
of
Broadway
.
β’
Many
famous
musicians
also
act
in
movies
nowadays
.
Many
famous
musicians
also
act
in
movies
nowadays
.
Same
origin
as
general
verb
sense
,
later
specialized
to
theatrical
performance
in
the
14th
century
.
noun
one
of
the
main
parts
into
which
a
play
,
opera
,
or
other
performance
is
divided
β’
The
first
act
ends
with
a
dramatic
sword
fight
.
The
first
act
ends
with
a
dramatic
sword
fight
.
β’
There
will
be
a
short
break
between
act
two
and
act
three
.
There
will
be
a
short
break
between
act
two
and
act
three
.
The
use
for
divisions
of
a
play
dates
to
the
late
16th
century
.
noun
a
written
law
made
by
a
parliament
or
congress
β’
Parliament
passed
an
Act
to
protect
clean
water
.
Parliament
passed
an
Act
to
protect
clean
water
.
β’
The
new
act
will
come
into
force
next
year
.
The
new
act
will
come
into
force
next
year
.
impact
noun
the
powerful
effect
or
influence
that
something
has
on
someone
or
something
β’
Social
media
has
a
huge
impact
on
how
teenagers
see
the
world
.
Social
media
has
a
huge
impact
on
how
teenagers
see
the
world
.
β’
The
new
law
will
create
a
positive
impact
for
small
businesses
.
The
new
law
will
create
a
positive
impact
for
small
businesses
.
noun
the
force
of
one
object
hitting
another
β’
The
car's
airbag
softened
the
impact
of
the
crash
.
The
car's
airbag
softened
the
impact
of
the
crash
.
β’
When
the
meteor
hit
the
desert
,
the
impact
created
a
deep
crater
.
When
the
meteor
hit
the
desert
,
the
impact
created
a
deep
crater
.
verb
to
have
a
strong
effect
on
someone
or
something
β’
Rising
prices
impact
families
on
a
tight
budget
.
Rising
prices
impact
families
on
a
tight
budget
.
β’
The
decision
will
impact
the
future
of
the
company
.
The
decision
will
impact
the
future
of
the
company
.
verb
to
hit
something
with
force
β’
A
falling
branch
impacted
the
roof
during
the
storm
.
A
falling
branch
impacted
the
roof
during
the
storm
.
β’
The
asteroid
will
impact
Earth
in
a
distant
future
scenario
.
The
asteroid
will
impact
Earth
in
a
distant
future
scenario
.
Act
noun
a
formal
written
law
made
by
a
parliament
or
other
legislature
β’
The
Freedom
of
Information
Act
allows
citizens
to
request
government
records
.
The
Freedom
of
Information
Act
allows
citizens
to
request
government
records
.
β’
Parliament
passed
a
new
Act
to
protect
endangered
species
.
Parliament
passed
a
new
Act
to
protect
endangered
species
.
Sense
developed
in
15th-century
English
law
to
mean
an
official
deed
of
parliament
.
contract
noun
a
written
or
spoken
agreement
that
is
legally
binding
and
states
what
each
side
must
do
β’
The
builder
asked
us
to
read
the
contract
carefully
before
signing
.
The
builder
asked
us
to
read
the
contract
carefully
before
signing
.
β’
After
winning
the
championship
,
the
player
signed
a
million-dollar
contract
with
the
team
.
After
winning
the
championship
,
the
player
signed
a
million-dollar
contract
with
the
team
.
verb
-
contract
,
contracting
,
contracts
,
contracted
to
become
smaller
or
shorter
,
or
to
make
something
smaller
,
often
because
of
cold
or
tightening
β’
When
the
weather
turned
cold
,
the
metal
pipes
began
to
contract
.
When
the
weather
turned
cold
,
the
metal
pipes
began
to
contract
.
β’
She
watched
the
balloon
contract
as
the
air
slowly
leaked
out
.
She
watched
the
balloon
contract
as
the
air
slowly
leaked
out
.
verb
-
contract
,
contracting
,
contracts
,
contracted
to
arrange
and
agree
to
do
work
or
provide
something
by
signing
a
formal
agreement
β’
The
city
decided
to
contract
a
new
company
to
collect
its
trash
.
The
city
decided
to
contract
a
new
company
to
collect
its
trash
.
β’
Our
firm
has
contracted
with
a
software
developer
to
build
the
app
.
Our
firm
has
contracted
with
a
software
developer
to
build
the
app
.
verb
-
contract
,
contracting
,
contracts
,
contracted
to
catch
or
develop
an
illness
or
disease
β’
He
contracted
the
flu
after
traveling
overseas
.
He
contracted
the
flu
after
traveling
overseas
.
β’
Many
sailors
contracted
scurvy
during
long
voyages
.
Many
sailors
contracted
scurvy
during
long
voyages
.
contact
noun
communication
or
connection
with
someone
β’
After
moving
abroad
,
Mia
kept
contact
with
her
grandparents
by
video
call
every
week
.
After
moving
abroad
,
Mia
kept
contact
with
her
grandparents
by
video
call
every
week
.
β’
I
finally
lost
contact
with
my
old
teacher
when
her
email
stopped
working
.
I
finally
lost
contact
with
my
old
teacher
when
her
email
stopped
working
.
Sense
extended
from
physical
touch
to
the
idea
of
maintaining
connection
by
letters
or
calls
in
the
mid-19th
century
.
verb
to
communicate
with
someone
,
especially
by
phone
,
email
,
or
letter
β’
You
can
contact
me
at
this
number
if
you
have
any
questions
.
You
can
contact
me
at
this
number
if
you
have
any
questions
.
β’
The
travel
agent
contacted
the
hotel
to
confirm
our
reservation
.
The
travel
agent
contacted
the
hotel
to
confirm
our
reservation
.
Verb
sense
developed
from
the
noun
in
early
20th-century
English
,
when
new
communication
tools
like
telephone
appeared
.
noun
the
state
of
two
people
or
things
touching
or
meeting
β’
The
baseball
made
contact
with
the
window
and
cracked
the
glass
.
The
baseball
made
contact
with
the
window
and
cracked
the
glass
.
β’
Wear
gloves
so
your
skin
doesn
β
t
come
into
direct
contact
with
the
hot
pan
.
Wear
gloves
so
your
skin
doesn
β
t
come
into
direct
contact
with
the
hot
pan
.
From
Latin
β
contactus
β
meaning
β
a
touching
β,
from
β
contingere
β β
to
touch
β.
noun
a
person
you
know
who
can
give
help
,
information
,
or
introductions
β’
Emma
used
her
uncle
as
a
contact
to
find
a
summer
job
at
the
bank
.
Emma
used
her
uncle
as
a
contact
to
find
a
summer
job
at
the
bank
.
β’
The
reporter
called
her
police
contact
for
details
about
the
accident
.
The
reporter
called
her
police
contact
for
details
about
the
accident
.
From
the
idea
of
someone
you
can
β
get
in
touch
with
β;
popular
in
business
English
since
the
20th
century
.
noun
the
state
of
two
or
more
things
touching
each
other
β’
Keep
fragile
items
apart
so
they
do
not
come
into
contact
.
Keep
fragile
items
apart
so
they
do
not
come
into
contact
.
β’
The
car
β
s
bumper
made
brief
contact
with
the
wall
,
leaving
a
scratch
.
The
car
β
s
bumper
made
brief
contact
with
the
wall
,
leaving
a
scratch
.
From
Latin
contactus
β
a
touching
,β
from
contingere
β
to
touch
.β
noun
communication
or
regular
exchange
with
someone
β’
We
kept
in
contact
by
email
while
she
studied
abroad
.
We
kept
in
contact
by
email
while
she
studied
abroad
.
β’
After
moving
to
a
new
city
,
he
lost
contact
with
many
old
friends
.
After
moving
to
a
new
city
,
he
lost
contact
with
many
old
friends
.
verb
to
communicate
with
someone
,
especially
by
phone
,
email
,
or
letter
β’
Please
contact
me
if
you
have
any
questions
.
Please
contact
me
if
you
have
any
questions
.
β’
The
company
contacted
all
applicants
by
phone
.
The
company
contacted
all
applicants
by
phone
.
verb
to
touch
or
meet
something
physically
β’
If
the
wires
contact
,
they
could
cause
a
short
circuit
.
If
the
wires
contact
,
they
could
cause
a
short
circuit
.
β’
The
rocket
must
avoid
contacting
space
debris
during
launch
.
The
rocket
must
avoid
contacting
space
debris
during
launch
.
Technical
in-transitive
verb
use
recorded
since
the
late
19th
century
in
engineering
manuals
.
noun
a
thin
lens
worn
directly
on
the
eye
(
short
form
of
β
contact
lens
β)
β’
I
put
my
left
contact
in
backwards
this
morning
and
it
felt
uncomfortable
.
I
put
my
left
contact
in
backwards
this
morning
and
it
felt
uncomfortable
.
β’
He
keeps
spare
contacts
in
his
wallet
just
in
case
one
falls
out
.
He
keeps
spare
contacts
in
his
wallet
just
in
case
one
falls
out
.
Shortened
from
β
contact
lens
,β
first
used
in
the
1960s
.
noun
a
person
you
know
who
can
give
you
information
or
help
β’
She
has
many
contacts
in
the
music
industry
who
can
find
new
singers
.
She
has
many
contacts
in
the
music
industry
who
can
find
new
singers
.
β’
A
good
journalist
relies
on
reliable
contacts
for
breaking
news
.
A
good
journalist
relies
on
reliable
contacts
for
breaking
news
.
noun
a
small
metal
or
carbon
part
in
a
circuit
that
touches
another
part
to
allow
electricity
to
flow
β’
The
relay
β
s
contacts
closed
and
powered
the
motor
.
The
relay
β
s
contacts
closed
and
powered
the
motor
.
β’
Dirty
contacts
can
cause
sparks
in
a
switch
.
Dirty
contacts
can
cause
sparks
in
a
switch
.
attract
verb
to
make
a
person
or
an
animal
interested
in
something
and
want
to
come
closer
,
join
,
or
take
part
β’
Colorful
balloons
outside
the
store
attract
many
children
inside
.
Colorful
balloons
outside
the
store
attract
many
children
inside
.
β’
The
museum
β
s
new
dinosaur
exhibit
attracted
hundreds
of
visitors
on
opening
day
.
The
museum
β
s
new
dinosaur
exhibit
attracted
hundreds
of
visitors
on
opening
day
.
Late
Middle
English
,
from
Latin
β
attrahere
β
meaning
β
to
draw
toward
β (
ad-
β
to
β
+
trahere
β
draw
,
pull
β).
verb
to
pull
something
toward
another
thing
by
a
natural
force
such
as
magnetism
or
gravity
β’
A
strong
magnet
can
attract
iron
nails
from
several
centimeters
away
.
A
strong
magnet
can
attract
iron
nails
from
several
centimeters
away
.
β’
The
Moon
β
s
gravity
attracts
ocean
water
,
causing
tides
on
Earth
.
The
Moon
β
s
gravity
attracts
ocean
water
,
causing
tides
on
Earth
.
Same
origin
as
other
senses
:
from
Latin
β
attrahere
β,
meaning
β
to
draw
toward
β.
exact
verb
to
demand
and
obtain
something
,
especially
by
authority
or
force
.
β’
The
conquerors
exacted
a
heavy
tax
from
the
defeated
city
.
The
conquerors
exacted
a
heavy
tax
from
the
defeated
city
.
β’
Rebels
vowed
to
exact
revenge
for
the
villagers
β
suffering
.
Rebels
vowed
to
exact
revenge
for
the
villagers
β
suffering
.
From
Latin
exactus
,
past
participle
of
exigere
meaning
β
to
demand
or
drive
out
,β
taken
into
English
as
a
verb
in
the
late
15th
century
.
react
verb
to
do
or
say
something
because
of
what
has
happened
or
what
someone
else
has
done
or
said
β’
When
the
fire
alarm
rang
,
all
the
students
reacted
quickly
and
left
the
building
.
When
the
fire
alarm
rang
,
all
the
students
reacted
quickly
and
left
the
building
.
β’
He
didn't
know
how
to
react
when
he
got
the
surprising
news
.
He
didn't
know
how
to
react
when
he
got
the
surprising
news
.
From
Latin
re-
"
again
"
+
agere
"
to
do
,
drive
",
via
French
rΓ©agir
.
verb
(
chemistry
)
to
change
and
form
something
new
when
mixed
with
another
substance
β’
Vinegar
and
baking
soda
react
to
make
bubbles
of
gas
.
Vinegar
and
baking
soda
react
to
make
bubbles
of
gas
.
β’
Iron
reacts
with
oxygen
and
forms
rust
over
time
.
Iron
reacts
with
oxygen
and
forms
rust
over
time
.
Same
origin
as
sense
1
;
the
scientific
use
developed
in
the
19th
century
as
chemistry
advanced
.