Definition of onesie in English:


Line breaks: one¦sie
Pronunciation: /ˈwʌnzi


  • 1A loose-fitting one-piece leisure garment covering the torso and legs: I’d had a bath and was in my onesie ready to settle down for yet another reality TV marathon
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    • The winter months have set in and all I want to do is kick back in front of the roaring fire whilst sporting my brand new onesie.
    • I have recently jumped on the band wagon and got myself a onesie.
    • Every night I came home from teaching, put on my onesie, wrapped myself in a duvet, and drank tea on the couch.
  • 2North American A one-piece close-fitting lightweight garment worn by a young child, usually having sleeves but leaving the legs uncovered and fastening with press studs at the crotch.
    More example sentences
    • By the time they bring their new little family member home, they've taken classes, read a library's worth of books, and bought enough onesies to fill an entire dresser.
    • The onesies, in sets of three, will be decorated with a peace symbol, a heart, and a happy face: peace, love, and happiness.
    • Onesies are very practical clothing for babies to wear.


1980s: from Onesies, a proprietary name for a garment of this type, based on one + -sy.

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