a game in which two players take turns marking either an or an in an open block of nine squares, the object being to complete a vertical, horizontal, or diagonal row of three of one's mark before the other player can
also tick-tack-toe or tick·tack·toe
A game played by two people, each trying to make a line of three X's or three O's in a boxlike figure with nine spaces.
Origin of tic-tac-toeProbably imitative of the sounds of the original children's game, in which players brought pencils down on a numbered slate with their eyes shut.
- Alternative form of tic-tac-toe.