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onesie Syllabification: one·sie
Pronunciation: /ˈwənzē/

Definition of onesie in English:


North American An infant’s one-piece close-fitting lightweight garment, usually having sleeves but leaving the legs uncovered and fastening with snaps at the crotch.
Example sentences
  • One vendor was even selling a baby's pink onesie emblazoned with the New York Police Department logo.
  • These days you can buy your baby daughter a BORN TO SHOP onesie with little pink purses on it.
  • As you can tell from his onesie, I exclusively breastfeed.


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

Definition of onesie in:
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