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English definition of “informal”

informal

adjective     /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.Manners and levels of formalityPolite and respectful Grammar:Formal and informal languageWe use formal language in situations that are serious or that involve people we don’t know well. Informal language is more commonly used in situations that are more relaxed and involve people we know well.See moreGrammar:RegisterWe use the term ‘register’ to refer to particular varieties or styles of speaking and writing. Registers vary because the language is used for different purposes, in different contexts and for different audiences. For example, there is a legal register, a register of advertising, registers of banking and a register of weather forecasting. We commonly recognise registers because of their specialised vocabulary but also because of particular uses of grammar. We also use the term register to refer to whether language is being used formally or informally:See more informally     /-i/ adverb C1 It's an outdoor party, so dress informally. They've agreed informally to separate.Manners and levels of formalityPolite and respectful informality     /ˌɪn.fɔːˈmæl.ə.ti/ US  /-fɔːrˈmæl.ə.t̬i/ noun [U] Manners and levels of formalityPolite and respectful
(Definition of informal adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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