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certain
adjective
sure
or
confident
about
something
,
with
no
doubt
•
Maya
was
certain
she
had
locked
the
front
door
.
Maya
was
certain
she
had
locked
the
front
door
.
•
The
coach
sounded
certain
that
the
team
would
win
the
match
.
The
coach
sounded
certain
that
the
team
would
win
the
match
.
from
Old
French
certain
,
from
Latin
certus
“
fixed
,
sure
”.
adjective
sure
to
happen
;
inevitable
•
With
dark
clouds
like
those
,
rain
is
almost
certain
.
With
dark
clouds
like
those
,
rain
is
almost
certain
.
•
Failure
is
certain
if
we
do
not
plan
ahead
.
Failure
is
certain
if
we
do
not
plan
ahead
.
determiner
used
before
a
noun
to
refer
to
a
particular
person
or
thing
without
naming
them
•
A
certain
student
left
her
notebook
in
the
library
.
A
certain
student
left
her
notebook
in
the
library
.
•
They
met
again
by
certain
chance
in
Paris
.
They
met
again
by
certain
chance
in
Paris
.
pronoun
some
but
not
all
of
a
particular
group
that
has
been
mentioned
•
Certain
of
the
cookies
were
already
gone
.
Certain
of
the
cookies
were
already
gone
.
•
Certain
of
his
friends
knew
the
secret
.
Certain
of
his
friends
knew
the
secret
.
certainly
adverb
without
any
doubt
;
definitely
•
He
will
certainly
pass
the
exam
if
he
keeps
studying
this
hard
.
He
will
certainly
pass
the
exam
if
he
keeps
studying
this
hard
.
•
There
is
certainly
enough
cake
for
everyone
at
the
party
.
There
is
certainly
enough
cake
for
everyone
at
the
party
.
From
Middle
English
certeinli
,
from
Old
French
certeinement
,
from
Latin
certus
(“
sure
,
settled
”)
+
-ly
.
interjection
used
to
say
“
yes
”
in
a
polite
or
emphatic
way
,
especially
when
agreeing
to
a
request
•
"
Could
you
forward
me
the
email
?" — "
Certainly
!"
"
Could
you
forward
me
the
email
?" — "
Certainly
!"
•
The
waiter
said
, "
Certainly
,
right
away
,"
when
the
customer
asked
for
more
water
.
The
waiter
said
, "
Certainly
,
right
away
,"
when
the
customer
asked
for
more
water
.
Same
origin
as
the
adverb
sense
,
developing
a
standalone
affirmative
use
in
polite
speech
during
the
18th–19th
centuries
.
certainty
noun
-
certainty
,
certainties
,
certify
,
certifying
,
certifies
,
certified
the
state
of
being
completely
sure
about
something
,
without
any
doubt
•
The
professor
explained
the
theory
with
absolute
certainty
.
The
professor
explained
the
theory
with
absolute
certainty
.
•
Maya
answered
the
interview
question
with
calm
certainty
,
impressing
the
panel
.
Maya
answered
the
interview
question
with
calm
certainty
,
impressing
the
panel
.
Late
Middle
English
:
from
Old
French
certaineté
,
based
on
Latin
certus
‘
sure
’.
noun
-
certainty
,
certainties
,
certify
,
certifying
,
certifies
,
certified
something
that
will
definitely
happen
or
is
definitely
true
•
After
weeks
without
rain
,
a
storm
tomorrow
is
almost
a
certainty
.
After
weeks
without
rain
,
a
storm
tomorrow
is
almost
a
certainty
.
•
It
’
s
a
certainty
that
the
sun
will
rise
every
morning
.
It
’
s
a
certainty
that
the
sun
will
rise
every
morning
.
Late
Middle
English
:
from
Old
French
certaineté
,
based
on
Latin
certus
‘
sure
’.
uncertainty
noun
-
uncertainty
,
uncertainties
the
state
of
not
knowing
what
will
happen
or
how
something
will
turn
out
•
With
the
storm
approaching
,
there
was
a
lot
of
uncertainty
about
whether
the
game
would
go
ahead
.
With
the
storm
approaching
,
there
was
a
lot
of
uncertainty
about
whether
the
game
would
go
ahead
.
•
Starting
a
new
job
can
bring
excitement
as
well
as
uncertainty
about
the
future
.
Starting
a
new
job
can
bring
excitement
as
well
as
uncertainty
about
the
future
.
from
uncertain
+
-ty
,
first
recorded
in
Middle
English
noun
-
uncertainty
,
uncertainties
something
that
is
not
known
or
cannot
be
predicted
•
Global
trade
faces
many
uncertainties
in
the
current
political
climate
.
Global
trade
faces
many
uncertainties
in
the
current
political
climate
.
•
Rising
fuel
prices
are
one
of
the
major
uncertainties
for
airlines
this
year
.
Rising
fuel
prices
are
one
of
the
major
uncertainties
for
airlines
this
year
.
noun
-
uncertainty
,
uncertainties
the
possible
amount
by
which
a
measured
or
calculated
value
may
differ
from
the
true
value
•
The
scientist
reported
a
length
of
12
.
3
cm
with
an
uncertainty
of
±0
.
1
cm
.
The
scientist
reported
a
length
of
12
.
3
cm
with
an
uncertainty
of
±0
.
1
cm
.
•
Always
include
the
uncertainty
when
you
publish
experimental
results
.
Always
include
the
uncertainty
when
you
publish
experimental
results
.