informal Meaning in the Cambridge English Dictionary
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Meaning of “informal” in the English Dictionary

"informal" in British English

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informaladjective

uk   /ɪnˈfɔː.məl/  us   /-ˈfɔːr-/
B2 (of ​situations) not ​formal or ​official, or (of ​clothing, ​behaviour, ​speech) ​suitable when you are with ​friends and ​family but not for ​officialoccasions: The two ​groupsagreed to ​hold an informal ​meeting. He's the ​idealsort of ​teacher - ​direct, ​friendly, and informal. "Hi" is an informal way of ​greetingpeople.
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informally
adverb uk   us   /-i/
C1 It's an ​outdoorparty, so ​dress informally. They've ​agreed informally to ​separate.
informality
noun [U] uk   /ˌɪn.fɔːˈmæl.ə.ti/  us   /-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 ​specialoccasions: an informal ​gathering Informal ​talksresumed 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 ​dinnerparty.
(Definition of informal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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