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

We know the story and the iconography: a toddler in a onesie who uses his imagination and a purple crayon to make his world more exciting.

From Los Angeles Times

Anna Parker found the image online: a teal onesie with a handwritten note pinned to the front.

From Seattle Times

Pam Dunsmore, 36, and her husband, Jaymes, 35, of Fullerton came to the rally with their 1-year-old daughter, Addie, who wore pink socks and a onesie dotted with hearts.

From Los Angeles Times

The baby, who will be an Australian citizen from birth, will start his cultural education early: Among the gifts, which included a platypus-patterned onesie and an electric nail trimmer, were three children’s books that are classics of an Australian childhood.

From New York Times

A girl in a pink chef’s hat, a boy in a Spider-Man hoodie, a girl in a ballerina tutu, a boy with light-up sneakers, a girl in a unicorn onesie and dozens of other energetic children meander through the line, clutching their parents’ hands.

From Los Angeles Times