Definition of impression noun from the Oxford Advanced American Dictionary

      

    impression

     noun
    noun
    NAmE//ɪmˈprɛʃn//
     
     
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    idea/opinion
  1. 1an idea, a feeling, or an opinion that you get about someone or something, or that someone or something gives you a general/an overall impression an initial/a lasting impression impression (of somebody/something) to get a good/bad impression of someone or something My first impression of him was favorable. She gives the impression of being very busy. impression (that…) I did not get the impression that they were unhappy about the situation. My impression is that there are still a lot of problems. Try and smile. You don't want to give people the wrong impression (= that you are not friendly).
  2. effect
  3. 2the effect that an experience or a person has on someone or something a big impression impression (on somebody) His trip to India made a strong impression on him. My words made no impression on her. You'll have to play better than that if you really want to make an impression (= to make people admire you).
  4. drawing
  5. 3a drawing showing what a person looks like or what a place or a building will look like in the future This is an artist's impression of the new stadium.
  6. amusing copy of someone
  7. 4 impression (of somebody) an amusing copy of the way a person acts or speaks He did his impression of Homer Simpson.
  8. false appearance
  9. 5an appearance that may be false Clever lighting creates an impression of space in a room.
  10. mark
  11. 6a mark that is left when an object is pressed hard into a surface The dentist made an impression of his teeth.
  12. book
  13. 7all the copies of a book that are printed at one time, with few or no changes to the contents since the last time the book was printed compare edition
  14. Idioms
    (be) under the impression that…
     
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    believing, usually wrongly, that something is true or is happening I was under the impression that the work had already been completed. The soldiers scattered, under the impression that it was an enemy attack. Thesaurusthinkbelieve feel be under the impressionThese words all mean to have an idea that something is true or possible or to have a particular opinion about someone or something.think to have an idea that something is true or possible, although you are not completely certain; to have a particular opinion about someone or something:Do you think (that) they'll come? What do you think about Matt's new girlfriend?believe to have an idea that something is true or possible, although you are not completely certain; to have a particular opinion about someone or something:Police believe (that) the man may be armed.think or believe?When you are expressing an idea that you have or that someone has of what is true or possible, believe is more formal than think. It is used especially for talking about ideas that other people have;think is used more often for talking about your own ideas:Police believe… I think…When you are expressing an opinion, believe is stronger than think and is used especially for matters of principle;think is used more for practical matters or matters of personal taste.feel to have a particular opinion about something that has happened or about what you/someone ought to do:We all felt (that) we had been cheated.be under the impression that… to have an idea that something is true:I was under the impression that the work had already been completed.Patterns to think/believe/feel/be under the impression that… It is thought/believed/felt >that…> to be thought/believed/felt >to be>something to think/believe/feel something about somebody/something to sincerely/honestly/seriously/mistakenly think/believe/feel
See the Oxford Advanced Learner's Dictionary entry: impression