An effect, feeling, or image retained as a consequence of experience: Seeing the glacier made a big impression on us. A vague notion, remembrance, or belief: I have the impression that we have met once before. A mark produced on a surface by pressure. The act or process of impressing: The impression of the company's name in the products is done by machine. Printing All the copies of a publication printed at one time from the same set of type. A single copy of such a printing. A humorous imitation of the voice and mannerisms of a famous person. An initial or single coat of color or paint. Dentistry An imprint of the teeth and surrounding tissues, formed with a plastic material that hardens into a mold for use in making dentures, inlays, or plastic models.