co·​spon·​sor | \ (ˌ)kō-ˈspän(t)-sər How to pronounce cosponsor (audio) \
variants: or co-sponsor
plural cosponsors or co-sponsors

Definition of cosponsor

: a joint sponsor The senator was a cosponsor for both bills. Michigan Tech Student Relay For Life is a participating cosponsor of this event.The Daily Mining Gazette

Keep scrolling for more

Other Words from cosponsor

cosponsor or co-sponsor transitive verb cosponsored or co-sponsored; cosponsoring or co-sponsoring
This year Simpson is carrying on the legislative struggle without Mazzoli, who has declined to cosponsor the bill without support from the Democratic House leadership … — George Russell The following summer, Bingham returned to Machu Picchu with an expedition co-sponsored by the National Geographic Society. — Duane Damon
cosponsorship \ (ˌ)kō-​ˈspän(t)-​sər-​ˌship How to pronounce cosponsor (audio) \ or co-sponsorship noun
Increasingly, large urban malls are being built with the co-sponsorship of city governments. — Witold Rybczynski

Examples of cosponsor in a Sentence

Recent Examples on the Web Throughout the 116th Congress, the Chamber has urged members to either cosponsor — or refrain from cosponsoring — specific bills. Andrew Stuttaford, National Review, "The Chamber of Commerce’s Botched Bet," 16 Apr. 2021 His office later cited 13 bills that Hawley has signed onto as a cosponsor since January that include Democrats., "Josh Hawley became a pariah in Washington after the insurrection. Does it matter?," 29 Mar. 2021 Councilwoman Madonna Flood, D-24th, and Councilman Markus Winkler, D-17th, a cosponsor of the legislation. Darcy Costello, The Courier-Journal, "Free speech or threat? How a doxxing ban split the Louisville Metro Council down the middle," 26 Mar. 2021 The resolution to eliminate the deadline has one Republican cosponsor in the House, Congressman Tom Reed. Grace Segers, CBS News, "House set to vote to reauthorize Violence Against Women Act," 16 Mar. 2021 Senator Sheldon Whitehouse, a Democratic from Rhode Island, also is a cosponsor. Shannon Larson,, "Think daylight saving time should be year-round? Ed Markey, other senators do, too," 10 Mar. 2021 Dave Joyce is the lead GOP cosponsor of a U.S. House bill that would set up an animal cruelty section in the Justice Department’s environmental and natural resources division. Jeremy Pelzer, cleveland, "Legislation to end the death penalty in Ohio gains bipartisan support: Capitol Letter," 19 Feb. 2021 According to GovTrack, 10 of Slotkin’s 15 bills and resolutions in 2019 had a Republican cosponsor. Clara Hendrickson, Detroit Free Press, "Slotkin's GOP challenger says she's misleading voters on her record. We fact-checked it.," 22 Sep. 2020 Senator Susan Collins signed on to the bill last November, the first republican cosponsor. Rachel Nuwer, Longreads, "The Strange and Dangerous World of America’s Big Cat People," 10 Mar. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cosponsor.' 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 cosponsor

1849, in the meaning defined above

Keep scrolling for more

Learn More about cosponsor

Time Traveler for cosponsor

Time Traveler

The first known use of cosponsor was in 1849

See more words from the same year

Statistics for cosponsor

Last Updated

26 Apr 2021

Cite this Entry

“Cosponsor.” Dictionary, Merriam-Webster, Accessed 17 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on cosponsor

Thesaurus: All synonyms and antonyms for cosponsor

Comments on cosponsor

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


Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
True or False

Test your knowledge - and maybe learn something along the way.

 AlphaBear 2

Spell words. Make bears.

Love words? Need even more definitions?

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