one·​sie | \ ˈwən-zē How to pronounce onesie (audio) \
plural onesies

Definition of onesie

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 All eyes were on Pharrell Williams' wife, Helen Lasichanh, during the Met Gala on May 1, but it was for all the wrong reasons. We were hoping Helen would show off her amazing post-baby body after birthing triplets, but instead, she covered her body in a giant red onesie that some Twitter users were comparing to the red Teletubbie!— Christopher Rogers

Examples of onesie in a Sentence

Recent Examples on the Web

Beauty mogul Jenner shared a sweet Instagram photo of her famous toddler toting a bright pink mini Kelly purse while wearing a crochet onesie and metallic sandals today. Erica Gonzales, Harper's BAZAAR, "Kylie Jenner Shares a Video of One-Year-Old Stormi Carrying a Mini Hermès Bag with Travis Scott," 1 Apr. 2019 The Duke and Duchess of Cambridge’s oldest child also wore a pale blue onesie to his first Trooping the Colour parade on the iconic balcony of Buckingham Palace in 2014, just like his dad did in 1984. Janine Puhak, Fox News, "Prince George wears matching outfit with Prince William, 33 years later," 27 July 2018 True seems to be wearing a light pink and white onesie. Alison Caporimo, Seventeen, "Here's Khloé Kardashian and Tristan Thompson's FULL Relationship Timeline," 26 July 2018 Canadian High Commissioner to the United Kingdom Janice Charette presented the baby clothes to the royal couple, which included a maple leaf onesie. Chloe Foussianes, Town & Country, "Meghan Markle Steps Out in a Sequined Erdem Coat During a Commonwealth Day Engagement," 11 Mar. 2019 The twins are wearing onesies that Klobuchar gave them. Julia Felsenthal, Vogue, "Personable, Popular, Pragmatic: Is Minnesota Senator Amy Klobuchar the Democrat’s Secret Weapon?," 15 Jan. 2019 Mothers like one or two extravagant outfits to show their babies off occasionally, but on a day-to-day basis onesies with snap closures, stretchy cotton fabrics and anything which can be thrown in the washer and dryer are ideal. Naomi Williamson, Woman's Day, "10 Things Never to Buy a New Mom," 23 July 2014 The bot’s eyes have six layers of projections to create an impression of depth, and its exterior (covered by a furry onesie that can be removed for washing) is touch sensitive. James Vincent, The Verge, "Japan’s latest home robot isn’t useful — it’s designed to be loved," 20 Dec. 2018 For baby gifts, check out FORAI (Friends of Refugees and Immigrants), a nonprofit that sells the cutest onesies, all of which help the artisans sustain sewing micro-businesses. Jane Mosbacher Morris, Marie Claire, "5 Easy Ways to Use Your Wallet to Create Real Change," 31 Jan. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'onesie.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of onesie

1983, in the meaning defined at sense 1

History and Etymology for onesie

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

Keep scrolling for more

Learn More about onesie

Statistics for onesie

Last Updated

17 Apr 2019

Look-up Popularity

Time Traveler for onesie

The first known use of onesie was in 1983

See more words from the same year

Comments on onesie

What made you want to look up onesie? Please tell us where you read or heard it (including the quote, if possible).


an act or instance of returning to life

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!