[in-fawr-muh l] /ɪnˈfɔr məl/

without formality or ceremony; casual:
an informal visit.
not according to the prescribed, official, or customary way or manner; irregular; unofficial:
informal proceedings.
suitable to or characteristic of casual and familiar, but educated, speech or writing.
Grammar. characterizing the second singular pronominal or verbal form, or its use, in certain languages:
the informal tu in French.
not of a formal, official, or stiffly conventional nature: an informal luncheon
appropriate to everyday life or use: informal clothes
denoting or characterized by idiom, vocabulary, etc, appropriate to everyday conversational language rather than to formal written language
denoting a second-person pronoun in some languages used when the addressee is regarded as a friend or social inferior: In French the pronoun “tu” is informal, while “vous” is formal

mid-15c., “lacking form; not in accordance with the rules of formal logic,” from in- (1) “not, opposite of” + formal. Meaning “irregular, unofficial” is from c.1600. Sense of “done without ceremony” is from 1828. Related: Informally.


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