A holiday in remembrance of Saint Valentine, February 14th, celebrated by sending cards or similar tokens of love.

(philately) A letter or card with new stamp, posted on the day that the stamp was first issued.

(sports) A three-phase equestrian sport consisting of dressage, cross country, and show jumping.

plural of Latter-day Saint

(idiomatic) To make someone happy, or be a source of satisfaction, for the rest of the day.

(US Army, US Air Force and US Navy, derogatory, slang) Newly-commissioned graduate of three-month Officer Candidate School (Army, Air Force), Midshipman School (Navy), or Direct Commissioning program.

Alternative form of St. Stephen's Day.

(Christianity) A Christian holiday commemorating Saint Stephen the protomartyr (first Christian martyr; died 34 C.E.), falling immediately after Christmas Day (on December 26 in the Western Church and on December 27 in the Eastern Orthodox Church).

plural of red-letter day

alternative form of red letter day