valentine

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A sentimental or humorous greeting card sent to a sweetheart, friend, or family member, for example, on Saint Valentine's Day.
2. n. A gift sent as a token of love to one's sweetheart on Saint Valentine's Day.
3. n. A person singled out especially as one's sweetheart on Saint Valentine's Day.

Century Dictionary and Cyclopedia

1. n. A sweetheart or choice made On St. Valentine's dav. This name is derived from St. Valentine, to whom February 14th is sacred. It was a very old notion, alluded to by Shakspere, that on this day birds begin to mate: “For this was on seynt Valentines dav, Whan every brid cometh ther to chese his make.” Chaucer, Parliament of Fowls, 1. 310.
2. n. A letter or missive sent by one person to another of the opposite sex on St. Valentine's day; a written or printed or painted missive of an amatory or a satirical kind, generally sent anonymously. The sentimental class are often highly ornamental and expensive productions, usually bearing pretty pictures on the subject of courtship or matrimony; the comic class are generally coarse and vulgar productions, usually with caricatures of the human form depicted on them, and are often meant to reflect on the personal appearance, habits, character, etc., of the recipient.

Wiktionary

1. n. An expression of affection, especially romantic affection, usually in the form of greeting card, gift, or message given to a person the object of affection, especially on February 14th.
2. n. A person to whom a valentine is given or received, especially on February 14th.

GNU Webster's 1913

1. n. A sweetheart chosen on St. Valentine's Day.
2. n. A letter containing professions of love, or a missive of a sentimental, comic, or burlesque character, sent on St. Valentine's Day.

WordNet 3.0

1. n. a sweetheart chosen to receive a greeting on Saint Valentine's Day
2. n. a card sent or given (as to a sweetheart) on Saint Valentine's Day