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English definition of “informal”

informal

adjective    /ɪnˈfɔr·məl/
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    /ˌɪn·fɔrˈmæl··t̬i/ noun [U] informally    /ɪnˈfɔr·mə·li/ adverb It’s OK to dress informally for the dinner party.
(Definition of informal adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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