Longman Dictionary of Contemporary English homepage

informal

 adjective
     
Related topics: Literature, Clothes
in‧for‧mal W3
1 relaxed and friendly without being restricted by rules of correct behaviour [≠ formal]:
The atmosphere at work is fairly informal.
The two groups met for informal talks.
2AL an informal style of writing or speaking is suitable for ordinary conversations or letters to friends [≠ formal]
3DCC informal clothes are suitable for wearing at home or in ordinary situations [= casual; ≠ formal]
—informally adverb
—informality noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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