- 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(of clothes) suitable for wearing at home or when relaxing rather than for a special or an official occasion synonym casual opposite formal
- 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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NAmE//ɪnˈfɔrməli//adverb They told me informally (= not officially) that I got the job. to dress informally