cosponsor

noun

co·​spon·​sor (ˌ)kō-ˈspän(t)-sər 

variants or co-sponsor

plural cosponsors or co-sponsors

: 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

cosponsor transitive verb

or co-sponsor

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 

noun

or co-sponsorship

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

Smith was among the cosponsors of a bipartisan hydro tax credit bill in 2023. —Daniel Moore, Axios, 10 Feb. 2025

This time, Biggs does not have any cosponsors on his bill. —Jamie Ducharme, TIME, 6 Feb. 2025

Senators Mike Rounds and Tina Smith have joined as original cosponsors, highlighting the bipartisan support for this initiative. —John Yoo and John Shu, Newsweek, 23 Jan. 2025

House members who did not sign on as cosponsors are Republican Reps. Chuck Edwards, Virginia Foxx, Brad Knott and Pat Harrigan, and Democrat Alma Adams. —Alan Wooten | The Center Square, Washington Examiner - Political News and Conservative Analysis About Congress, the President, and the Federal Government, 26 Jan. 2025

Word History

First Known Use

1849, in the meaning defined above