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



BrE BrE//ɪn//
; NAmE NAmE//ɪn//
The fashion world
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[usually before noun] (informal) popular and fashionable Purple is the in colour this spring. Exotic pets are the in thing right now. Short skirts are in again. see also in-joke See related entries: The fashion world Word OriginOld English in (preposition), inn, inne (adverb), of Germanic origin; related to Dutch and German in (preposition), German ein (adverb), from an Indo-European root shared by Latin in and Greek en.
See the Oxford Advanced American Dictionary entry: in