Etymology
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tick-tack-toe (n.)

children's three-in-a-row game with Xs and Os, so called by 1892, earlier tit-tat-toe (by 1852, in reminiscences of earlier years), also called noughts and crosses (1852), also oughts and crosses. Probably from the sound of the pencil on the slate with which it originally was played by schoolboys. Also the name of a children's counting rhyme played on slate (also originally tit-tat-toe, by 1842), and compare tick-tack (1580s), a form of backgammon, possibly from French trictrac, perhaps imitative of the sound of tiles on the board.

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Definitions of tick-tack-toe

tick-tack-toe (n.)
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;
Synonyms: ticktacktoe / ticktacktoo / tic-tac-toe / tit-tat-toe / noughts and crosses
From wordnet.princeton.edu