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English definition of “informal”

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informal

adjective 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 official occasions: The two groups agreed to hold an informal meeting. He's the ideal sort of teacher - direct, friendly, and informal. "Hi" is an informal way of greeting people.
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informally
adverb uk   /-i/ us  
C1 It's an outdoor party, 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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