Definitions:

1. a game in which two players alternately put crosses and circles in one of the compartments of a square grid of nine spaces noun
   • As they waited for the bus on a cold winter day, Sarah and Jack amused themselves by drawing a grid in the snow and playing several rounds of ticktacktoe. Just when Sarah thought she had the upper hand, Jack made a surprise move and claimed victory, leaving them both grinning from ear to ear.

Synonyms:

• noughts and crosses
• tic-tac-toe
• tick-tack-toe
• ticktacktoo
• tit-tat-toe