Onesie

//ˈwʌn.zi// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Any of various one-piece attires

    "It was once considered taboo to even suggest that new motherhood was not all sunshine onesies and rainbow mobiles, and “Baby Ruby” arrives on a welcome wave of contemporary movies exploring how the joys of child rearing can commingle with misery."

  2. 2
    Any of various one-piece attires:; A one-piece garment for an infant or small child, generally worn over a diaper. US
  3. 3
    Any of various one-piece attires:; A one-piece adult loungewear jumpsuit.
  4. 4
    Any of various one-piece attires:; A one-piece fashionable streetwear worn mostly by teenagers.

Synonyms

All synonyms
creeperdiaper shirtone-piece suitromperromperromper suit

Example

More examples

"I really like the pandas on your onesie."

Etymology

From the Gerber Childrenswear brand name Onesies. The name became generic and was reinterpreted as a plural, hence the new singular and decapitalized onesie. Equivalent to one + -sie.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.