Real Dictionary

tick-tack-toe in American English
a game in which two players take turns marking either X's or O's 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
noun: a simple game in which one player marks down only X's and another only O's, each alternating in filling in any of the nine compartments of a figure formed by two vertical lines crossed by two horizontal lines, the winner being the first to fill in three m

tick-tack-toe in British English
noun: a game in which two players, one using a nought, " O", the other a cross, " X", alternately mark one square out of nine formed by two pairs of crossed lines, the winner being the first to get three of the symbols in a row