onesie

[wuhn-zee]

noun

1. a one-piece leisure or sleeping garment for an adult, usually combining a long-sleeved top with long pants.

Trademark.

1. Onesies, a brand name for one-piece garments for infants, the lower portion resembling briefs and having snaps across the crotch for convenience in diapering. Although a trademarked term, it is often spelled as lowercase onesie, referring to a single garment.

onesie

/ ˈwʌnzɪ /

noun

1. a one-piece garment combining a top with trousers, worn by adults as leisurewear

Word History and Origins

Origin of onesie¹

First recorded in 1980–85; originally a trademark

Example Sentences

Dodgers were undefeated when my 6 month old wore a Dodgers onesie, until game 1 of the World Series.

Read more on Los Angeles Times

The 66-pound robot wears a sweater-like onesie, because nothing says “I’m harmless” like cozy knitwear.

Read more on The Wall Street Journal

We even brought our 3-month-old son, nestled in a stroller in his “Housing Is a Human Right” onesie, the youngest person at the conference.

Read more on Slate

Emmanuel was last seen wearing a black onesie with a Nike logo.

Read more on Los Angeles Times

The boy was last seen wearing a black onesie, authorities said.

Read more on Los Angeles Times

When To Use

What else does onesie mean?

A onesie is a one-piece item of loungewear or sleepwear. Traditionally, onesies are worn by babies, but they exploded into adult novelty fashion in the 2010s.How is onesie pronounced?[wuhn-zee]