American English

Definition of informal adjective from the Oxford Advanced American Dictionary



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  1. 1relaxed and friendly; not following strict rules of how to behave or do something an informal atmosphere an informal arrangement/meeting/visit Discussions are held on an informal basis within the department. The aim of the trip was to make informal contact with potential customers.
  2. 2(of clothes) suitable for wearing at home or when relaxing rather than for a special or an official occasion synonym casual opposite formal
  3. 3(of language) suitable for normal conversation and writing to friends rather than for serious speech and letters an informal expression compare formal, slang
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noun [uncountable]
adverb They told me informally (= not officially) that I got the job. to dress informally
See the Oxford Advanced Learner's Dictionary entry: informal

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