English definition of “impression”
OPINION [no plural] › 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] › when you copy the way a particular person or animal 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