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English definition of “expression”

expression

noun  /ɪkˈspreʃ·ən/ us  
[C] a word or group of words having a particular meaning or used in a particular way: That was an expression he hadn’t heard before, and wondered what it meant. mathematics [C] An expression is also a mathematical statement that includes numbers, symbols, or both.

expression noun (SHOW)

[C/U] the act of showing a feeling or idea, or a feeling or idea that is shown: [C] She had such a sad expression on her face that I wondered what was wrong. [U] Freedom of expression is a cherished right in democracies.
(Definition of expression from the Cambridge Academic Content Dictionary © Cambridge University Press)
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