Oxford Advanced American Dictionary

Definition of St Valentine's Day noun from the Oxford Advanced Learner's Dictionary

St Valentine's Day

noun
st valentine's day pronunciation English ˌsnt ˈvæləntaɪnz deɪ st valentine's day pronunciation American ˌseɪnt ˈvæləntaɪnz deɪ
 
the day (14 February), when people send a card to the person that they love, often without signing their name on it