[n] someone who contributes (or promises to contribute) a sum of money
[n] someone who contracts to receive and pay for a certain number of issues of a publication
[n] someone who expresses strong approval
admirer, booster, champion, client, customer, donor, friend, giver, presenter, protagonist, supporter
1. One who subscribes; one who contributes to an undertaking by subscribing.
2. One who enters his name for a paper, book, map, or the like. --Dryden.