1. the act or status of being a joint sponsor of a bill, event, or initiative, typically shared between two or more parties
Usage: commonly used in legislative and political contexts; also used in business, entertainment, and nonprofit sectors

Examples

• The senator announced her cosponsorship of the education reform bill alongside three colleagues.
• The music festival's cosponsorship by two major corporations helped fund the event.
• Cosponsorship of the research project allowed the universities to share costs and resources.
• The nonprofit sought cosponsorship from local businesses to expand its community programs.
• Under the cosponsorship agreement, both companies shared marketing responsibilities.
• The bill gained momentum after securing cosponsorship from members of both parties.