·noun A sweetheart chosen on St. Valentine's Day.
II. Valentine ·noun A letter containing professions of love, or a missive of a sentimental, comic, or burlesque character, sent on St. Valentine's Day.
The first woman seen by a man, or man seen by a woman, on St. Valentine's day, the 14th of February,...
Dictionary of The Vulgar Tongue by Francis Grose