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1.
The day on which ponies all over Equestria celebrate love, or in some regions, friendship.

Humans later copied the holiday, calling it 'Valentines Day', although so far it is widely agreed that it has failed to live up to the standards of the Equestrian holiday.
'Our teacher doesn't have a super special some-pony on hearts and hooves day?! We'd better get her one!!'
by TriariusTheThird February 14, 2012