Word.ws English Dictionary

onesie

Syllables: one·sie/ˈwʌn.zi/

onesie noun: a one-piece garment for an infant or small child, generally worn over a diaper.

Noun

onesie (plural onesies)

  1. (US) A one-piece garment for an infant or small child, generally worn over a diaper.
    • 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.2023 February 2, Natalia Winkelman, “‘Baby Ruby’ Review: Enfant Terrible”, in The New York Times
    • The Fever shared a video of the meeting on X (formerly known as Twitter), where an excited Clark got to hold the young baby and sign the youngster's onesie.2024 August 16, Natasha Dye, “Caitlin Clark Signs Indiana Fever Fan's 2-Week-Old Baby: 'So Cute'”, in People
  2. A one-piece adult loungewear jumpsuit.
  3. A one-piece fashionable streetwear worn mostly by teenagers.

Synonyms of onesie

Forms of onesie

pluralonesies

Plural of onesie: onesies

Origin of onesie

Genericized trademark from the Gerber Childrenswear brand name Onesies, which became reinterpreted as a plural. Equivalent to one + -sie.

Words formed from onesie

Phrases with onesie

Questions about onesie

What does onesie mean?
Onesie means a one-piece garment for an infant or small child, generally worn over a diaper.
What part of speech is onesie?
Onesie is a noun.
How do you pronounce onesie?
Onesie is pronounced /ˈwʌn.zi/.
What is the plural of onesie?
The plural of onesie is onesies.

Words near onesie in the dictionary

  1. oneshotted
  2. oneshotting
  3. Onesicritus
  4. onesided
  5. onesidedness
  6. onesie
  7. onesie-twosie
  8. onesied
  9. onesies
  10. onesome
  11. onesomes

Source and license

Adapted from Wiktionary: onesie (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Flame, not lame-onesie.wav.

Cite this entry: “onesie.” Word.ws, https://word.ws/onesie. Based on Wiktionary, CC BY-SA 4.0.