Meaning

• The indentation or depression made by the pressure of one object on or into another.

  "His head made an impression on the pillow."

• The overall effect of something, e.g., on a person.

  "He tried to make a good impression on his parents."

• A vague recalling of an event, a belief.

  "I have the impression that he's already left for Paris."

• An impersonation, an imitation of the mannerisms of another individual.

• An outward appearance.

• An online advertising performance metric representing an instance where an ad is shown once.

• The first coat of colour, such as the priming in house-painting etc.

• (engraving) A print on paper from a wood block, metal plate, etc.

• The vivid perception of something as it is experienced, in contrast to ideas or thoughts drawn from memory or the imagination.

Meaning

• To manipulate a blank key within a lock so as to mark it with impressions of the shape of the lock, which facilitates creation of a duplicate key.