Pronunciation: (tik"tak-tō'), [key]
1. 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 marks in any horizontal, vertical, or diagonal row.
2. a children's game consisting of trying, with the eyes shut, to bring a pencil down upon one of a set of circled numbers, as on a slate, the number touched being counted as a score. Also,tick-tack-tooPronunciation: (tik"tak-tOO'), [key] tic-tac-toe, tit-tat-toe.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.