Definition of informal adjective from the Oxford Advanced Learner's Dictionary

      

    informal

     adjective
    adjective
    BrE BrE//ɪnˈfɔːml//
     
    ; NAmE NAmE//ɪnˈfɔːrml//
     
    Describing clothes
     
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  1. 1  relaxed 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. These meetings should remain purely informal, with no obligation on either side.
  2. 2  (of clothes) suitable for wearing at home or when relaxing rather than for a special or an official occasion synonym casual Dress is informal, and storage space often limited, so you’ll be more comfortable travelling light. opposite formal See related entries: Describing clothes
  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
See the Oxford Advanced American Dictionary entry: informal

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