impression

noun

• 1an idea, feeling, or opinion about something or someone, especially one formed without conscious thought or on the basis of little evidence:his first impressions of Manchester were very positive they give the impression that all is sweetness and light
• an effect produced on someone:her courtesy and quick wit had made a good impression
• a difference made by the action or presence of someone or something:the floor was too dirty for the mop to make much impression

• 2an imitation of a person or thing, especially one done to entertain:he did an impression of Frank Sinatra
• a graphic or pictorial representation of someone or something:the police have issued an artist’s impression of the attacker

• 3a mark impressed on a surface by something:the impression of his body on the leaves
• Dentistry a negative copy of the teeth or mouth made by pressing them into a soft substance.

• 4the printing of a number of copies of a book, periodical, or picture for issue at one time.
• [usually with adjective] a particular printed version of a book or other publication, especially one reprinted from existing type, plates, or film with no or only minor alteration. Compare with edition.
• a print taken from an engraving.

• 5an instance of a pop-up or other Web advertisement being seen on computer users' screens.