1.a vague idea in which some confidence is placed;
his impression of her was favorable
2.an outward appearance;
he made a good impression
3.a clear and telling mental image;
he described his mental picture of his assailant
4.a concavity in a surface produced by pressing;
he left the impression of his fingers in the soft mud
5.a symbol that is the result of printing;
he put his stamp on the envelope
6.all the copies of a work printed at one time;
they ran off an initial printing of 2000 copies
7.(dentistry) an imprint of the teeth and gums in wax or plaster;
the dentist took an impression for use in preparing an inlay
8.an impressionistic portrayal of a person;
he did a funny impression of a politician
9.the act of pressing one thing on or into the surface of another;
he watched the impression of the seal on the hot wax