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English definition of “perception”

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perception

noun uk   /pəˈsep.ʃən/ us    /pɚ-/

perception noun (BELIEF)

C2 [C] a belief or opinion, often held by many people and based on how things seem: We have to change the public's perception that money is being wasted. These photographs will affect people's perceptions of war.
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perception noun (SIGHT)

[U] the quality of being aware of things through the physical senses, especially sight: Drugs can alter your perception of reality. [U] someone's ability to notice and understand things that are not obvious to other people: She has extraordinary powers of perception for one so young. He's not known for his perception.
(Definition of perception from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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