Meaning of “informal” in the English Dictionary

"informal" in British English

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informaladjective

uk /ɪnˈfɔː.məl/ us /ɪnˈfɔːr.məl/
informally
adverb uk /ɪnˈfɔː.mə.li/ us /ɪnˈfɔːr.mə.li/

C1

It's an outdoor party, so dress informally.
They've agreed informally to separate.
informality
noun [ U ] uk /ˌɪn.fɔːˈmæl.ə.ti/ us /ˌɪn.fɔːrˈmæl.ə.t̬i/

(Definition of “informal” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"informal" in American English

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informaladjective

us /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
noun [ U ] us /ˌɪn·fɔrˈmæl··t̬i/
informally
adverb us /ɪnˈfɔr·mə·li/

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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