Definition of onesie in English:

onesie

Syllabification: one·sie
Pronunciation: /ˈwənzē
 
/

noun

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.
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.

Origin

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

Definition of onesie in:

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