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English definition of “expression”

expression

noun [C]    /ɪkˈspreʃ·ən/
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 An expression is also a mathematical statement that includes numbers, symbols, or both.
(Definition of expression noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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