Valentine's Day
or Valentines Day or Valentine Day
noun
February 14, observed in honor of St. Valentine as a day for the exchange of valentines and other tokens of affection.
Also called
Saint Valentine's Day.
British Dictionary definitions for saint valentine's day
Saint Valentine's Day
noun usually abbreviated to: St Valentine's Day
Feb 14, the day on which valentines are exchanged, originally connected with the pagan festival of Lupercalia