expression Definition in Cambridge British English Dictionary
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Definition of "expression" - British English Dictionary

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expressionnoun

uk   us   /ɪkˈspreʃ.ən/

expression noun (SHOWING)

B2 [C or U] the act of saying what you think or showing how you feel using words or actions: He wrote her a poem as an expression of his love. We've received a lot of expressions of support for our campaign. Freedom of expression is a basic human right. It's better to give expression to (= show) your anger, rather than hiding it.formal His sadness at the death of his wife found expression (= was shown) in his music. She plays the violin with great expression (= feeling).B2 [C] the look on someone's face, showing what they feel or think: I could tell from her expression that something serious had happened. Mark always has such a miserable expression on his face.
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expression noun (WORDS)

B2 [C] a word or group of words used in a particular situation or by particular people: He uses a lot of unusual expressions. "A can of worms" is an expression that means "a difficult situation".
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expression noun (NUMBERS)

[C] in mathematics, a symbol or group of symbols that represent an amount: 4xy2 is an expression.
(Definition of expression from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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