From The Collaborative International Dictionary of English v.0.44 [gcide]:
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. [PJC]
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
98 Moby Thesaurus words for "sponsor": Maecenas, abettor, accept the responsibility, admirer, advocate, aficionado, angel, answer for, apologist, assure, attest, back, backer, bailsman, bankroll, be sponsor for, benefactor, bond, bondsman, buff, capitalize, certify, champion, confirm, countersecure, defender, dependence, encourager, endorse, endorser, ensure, exponent, fan, favorer, finance, financer, friend at court, fund, funder, godfather, godparent, grubstake, grubstaker, guarantee, guarantor, guaranty, insure, insurer, lover, mainpernor, mainstay, maintainer, meal ticket, mortgagor, paranymph, partisan, patron, patronize, pay for, promote, promoter, protagonist, provide for, refinance, reliance, second, seconder, sectary, secure, set up, sider, sign, sign for, stake, staker, stalwart, stand behind, stand sponsor for, stand up for, standby, subscribe to, subsidize, subsidizer, support, supporter, surety, sustainer, sympathizer, take the blame, take up, undersign, underwrite, underwriter, upholder, votary, warrant, warrantor, well-wisher
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