Pronunciation: (spon'sur),[key] —n. 1. a person who vouches or is responsible for a person or thing.
2. a person, firm, organization, etc., that finances and buys the time to broadcast a radio or television program so as to advertise a product, a political party, etc.
3. a person who makes a pledge or promise on behalf of another.
4. a person who answers for an infant at baptism, making the required professions and assuming responsibility for the child's religious upbringing; godfather or godmother.
—v.t. to act as sponsor for; promise, vouch, or answer for.