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1.
One who binds himself to answer for another, and is responsible for his default; a surety.
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2.
One who at the baptism of an infant professes the Christian faith in its name, and guarantees its religious education; a godfather or godmother.
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3.
A person who vouches for another as fit for some post or task; as, one needs two sponsors to be considered for membership.
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4.
A person or group that assumes financial responsibility for some activity, and may or may not participate in its organization and execution.
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5.
A person or organization, usually a commercial organization, which pays the cost of an activity, such as a radio or television broadcast, and in return is given the right to advertise itself or its products as part of the activity; as, now a word from our sponsor.