Pronunciation: /ˈsərtn̩/
adjective used to emphasize that something is definitely true or will definitely happen
A1 I am certain that the sun will rise tomorrow.
A2 She was certain that she had locked the door before leaving.
B1 There are certain rules that must be followed in this establishment.
B2 He was absolutely certain that he had made the right decision.
C1 The scientist was certain that their hypothesis would be proven correct.
C2 After years of research, the professor was certain of the validity of their theory.
pronoun used to refer to a particular thing or person without stating exactly which one
A1 I am certain that the sun will rise tomorrow.
A2 She is certain that she locked the door before leaving.
B1 I am certain that certain foods can trigger allergies.
B2 There are certain rules that must be followed in this establishment.
C1 He has a certain charm that makes him stand out in a crowd.
C2 Certain countries have strict laws regarding freedom of speech.
formal It is important to follow a certain protocol when conducting experiments.
informal I heard there's a certain way you have to fill out the paperwork.
slang There's a certain vibe about this place that I really like.
figurative She had a certain glow about her that made everyone notice.
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certains
more certain
most certain
certain
will certain
have certained
being certain
certain
certain
to certain
certaining
certained