onesie

noun

one·​sie ˈwən-zē How to pronounce onesie (audio)
plural onesies
1
: a bodysuit for an infant having a snap closure at the crotch and not covering the legs
… her husband, Prince William, gratefully accepted a onesie labeled "Daddy's Little Co-Pilot" from a well-wisher …—Michelle Tauber et al.
2
: a one-piece garment for adults usually with long sleeves and pants and sometimes with a hood
… pole-vaulter Holly Bradshaw wore a onesie rather than a crop top and bikini to win her bronze …—Vanessa Friedman

Examples of onesie in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Terrence was dressed in a giant yellow onesie—a Pokémon. — Danielle Parker, CBS News, 19 June 2026 The couple’s 1-year-old daughter, Frances Bean, perched on Love’s hip, outfitted in a pastel onesie. — Quinn Moreland, Pitchfork, 14 June 2026 An odd couple—one a goblin squeezed into an improbable trench-coat onesie, a fedora, and high heels—promenades down a steep incline while other strollers come and go. — Jeremy Lybarger, Artforum, 2 June 2026 Photos from the event’s heyday show the Eras Tour frontwoman posing with her ‘squad’ of gal pals in matching American flag onesies, or flashing peace signs in stars-and-stripes bikinis. — Bailey Bujnosek, InStyle, 21 May 2026 See All Example Sentences for onesie

Word History

Etymology

one entry 1 + -sie (after the trademark Onesies)

First Known Use

1983, in the meaning defined at sense 1

Time Traveler
The first known use of onesie was in 1983

Rhymes for onesie

See All Rhymes for onesie

Browse Nearby Words

one-sided
onesie
one-size-fits-all
See all Nearby Words

Cite this Entry

“Onesie.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/onesie. Accessed 7 Jul. 2026.

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