noughts and crosses

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noughts and crosses (uncountable)

1. (UK, Ireland, Commonwealth, games) A two-player game played on a three-by-three grid, in which players take it in turns to place their respective symbol (either a nought or a cross) in a cell of the grid, the objective being to form a row, column or diagonal of three of one's own symbol.

• ticktacktoe or tic-tac-toe (US)
• zero cross or zeroes and crosses (India)

• nine men's morris