noun (n)

• a vague idea in which some confidence is placed(noun.cognition)

  Example:
  His impression of her was favorable.
  

  Synonym:
  belief, feeling, notion, opinion
  

  source: wordnet30
• an outward appearance(noun.attribute)

  Example:
  He made a good impression.
  I wanted to create an impression of success.
  

  Synonym:
  effect
  

  source: wordnet30
• a clear and telling mental image(noun.cognition)

  Example:
  The events left a permanent impression in his mind.
  

  Synonym:
  mental picture, picture
  

  source: wordnet30
• a concavity in a surface produced by pressing(noun.shape)

  Example:
  He left the impression of his fingers in the soft mud.
  

  Synonym:
  depression, imprint
  

  source: wordnet30
• a symbol that is the result of printing or engraving(noun.communication)

  Synonym:
  stamp
  

  source: wordnet30
• all the copies of a work printed at one time(noun.communication)

  Synonym:
  printing
  

  source: wordnet30
• (dentistry) an imprint of the teeth and gums in wax or plaster(noun.artifact)

  Example:
  The dentist took an impression for use in preparing an inlay.
  

  source: wordnet30
• an impressionistic portrayal of a person(noun.act)

  Example:
  He did a funny impression of a politician.
  

  source: wordnet30
• the act of pressing one thing on or into the surface of another(noun.act)

  Example:
  He watched the impression of the seal on the hot wax.
  

  source: wordnet30
• The act of impressing, or the state of being impressed; the communication of a stamp, mold, style, or character, by external force or by influence.(noun)

  source: webster1913