Meaning of “impression” - Learner’s Dictionary

impression

noun uk us /ɪmˈpreʃən/
OPINION [ no plural ]

B2 an idea, feeling, or opinion about something or someone:

[ + (that) ] I got/had the impression that he was bored.
Monica gives the impression of being shy.
Remember that it makes a bad impression if you're late.
I think Mick was under the impression that (= thought that) we were married.
COPY [ C, U ]

a copy of the way someone speaks or behaves, often to make people laugh:

He does a brilliant impression of the president.
MARK [ C ]

a mark left when an object is pressed into something soft

(Definition of “impression” from the Cambridge Learner’s Dictionary © Cambridge University Press)