tick-tack-toe

noun

1. a game in which two players alternately put crosses and circles in one of the compartments of a square grid of nine spaces; the object is to get a row of three crosses or three circles before the opponent does

   noun.act

   Synonyms noughts and crosses tic-tac-toe ticktacktoe ticktacktoo tit-tat-toe

   Source: WordNet 3.0