(chess) A rule in professional chess that a player may declare the game to be a draw after 50 consecutive moves by each side without any capture or pawn movement, usually invoked during an inconclusive endgame.

plural of fifty-cent tour

(US, idiomatic, derogatory, usually humorous) A fast and general introduction to a place.

Alternative form of 50 cent army

Alternative form of 50 cent army

plural of fifty-first state

The area of the earth between 50 and 60 degrees south, prone to strong winds.

(music, very rare) A note played for 1⁄256 of the duration of a whole note.

plural of two hundred fifty-sixth note

Approximately fifty, particularly around fifty years old.