Sponsor  —n. 1 person who pledges money to a charity etc. In return for another person fulfilling a sporting etc. Challenge. 2 a patron of an artistic or sporting activity etc. B company etc. Supporting a broadcast in return for advertising time. 3 person who introduces legislation. 4 godparent at a baptism or (esp. Rc ch.) Person who presents a candidate for baptism. —v. Be a sponsor for.  sponsorial adj. Sponsorship n. [latin spondeo spons- pledge]