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Definition of onesie

onesie

/ˈwʌn.zi/
one · sie

Plural:onesies
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onesie Lexical Profile

onesie Game Scores & Validity

• noun

1

A close-fitting, one-piece garment for an infant or toddler that covers the torso and fastens with snaps between the legs to hold a diaper in place.

Example

"She packed several clean cotton onesies in the diaper bag before heading to the park."


2

A loose-fitting, casual one-piece jumpsuit for adults or older children, typically made of fleece or knit fabric and worn as loungewear or sleepwear.

Example

"After coming home from the chilly evening walk, he changed into a warm fleece onesie and made hot cocoa."

Synonyms
View all synonyms for onesie

Word Nuance & Usage

Originally registered as a trademark in the plural form 'Onesies' by the Gerber Childrenswear company for infant bodysuits, the singular lowercase form 'onesie' is now widely used as a generic term for both infant bodysuits and loose-fitting adult jumpsuits.

• Rhymes for onesie

Word Origin & Etymology

Coined in the early 1980s as a proprietary trademark by Gerber Childrenswear, formed from the numeral 'one' (referring to a one-piece garment) plus the informal diminutive suffix '-sie'.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Onesie. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/onesie
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