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English definition of “informal”

informal

adjective  /ɪnˈfɔr·məl/ us  
not formal or official, or not suitable for official or special occasions: an informal gathering Informal talks resumed today in an attempt to end the strike.
informality
noun [U]  /ˌɪn·fɔrˈmæl··t̬i/ us  
informally
adverb  /ɪnˈfɔr·mə·li/ us  
It’s OK to dress informally for the dinner party.
(Definition of informal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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