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

On Wednesday morning, Republican North Carolina Representative Pat Harrigan unveiled the SAFE Drivers Act alongside cosponsors, Texas Republican Representative Troy Nehls, and Missouri Republican Representative Bob Onder. —Billal Rahman, MSNBC Newsweek, 24 Oct. 2025

Along with Schriver, the bill has five other Republican cosponsors. —Arpan Lobo, Freep.com, 4 Oct. 2025

Ansari, the president of freshman Democrats, found one Republican cosponsor for her 14 bills that drew co-sponsorship from 184 fellow Democrats. —Ronald J. Hansen, AZCentral.com, 19 Sep. 2025

The Graham Blumenthal bill has 85 cosponsors in the Senate that will allow President Trump to tariff people who buy cheap Russian oil for their benefit, like China, India and Brazil. —NBC news, 14 Sep. 2025

Word History

First Known Use

1849, in the meaning defined above

Rhymes for cosponsor

• sponsor