Definition of: impression

(im·presh′ən) noun
1. The act of impressing or imprinting; the imparting of a distinguishing mark, form, or character.
2. The result of exterior influence, as impressment; a stamp, mark, or figure made by pressure.
3. An effect produced on the senses, the mind, the feelings, or the conscience.
4. A slight or indistinct remembrance; a notion or belief held by the mind without adequate grounds.
5. An effect left upon the mind, which resembles in any way, or bears the marks of, some past experience; specifically, any mental effect regarded as the resultant of a previous experience.
6. Printing a The imprint of types, illustrations, etc., on a page or sheet, b All the copies of a book printed at one time: especially, an unaltered reprint from standing type or from plates, as distinguished from edition. c One copy of a book, engraving, etching, etc. See synonyms under FEELING, IDEA, MARK¹. [<OF <L impressio, -onis]
—im·pres′sion·al adjective