/ ˈvæləntaɪn; NAmE / noun
1.
(also ˈvalentine card ) a card that you send to sb that you love on St Valentine's Day (14 February), often without putting your name on it
2.
a person that you send a valentine to
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WORD ORIGIN
late Middle English (denoting a person chosen (sometimes by lot) as a sweetheart or special friend): from Old French Valentin , from Latin Valentinus .