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From The Collaborative International Dictionary of English v.0.48:
Valentine \Val"en*tine\, n. 1. A sweetheart chosen on St. Valentine's Day. [1913 Webster] 2. A letter containing professions of love, or a missive of a sentimental, comic, or burlesque character, sent on St. Valentine's Day. [1913 Webster] St. Valentine's Day, a day sacred to St. Valentine; the 14th of February. It was a very old notion, alluded to by Shakespeare, that on this day birds begin to mate. Hence, perhaps, arose the custom of sending love tokens at that time. [1913 Webster]