from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A game played by two people, each trying to make a line of three X's or three O's in a boxlike figure with nine spaces.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative spelling of tic-tac-toe.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- 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
Probably imitative of the sounds of the original children's game, in which players brought pencils down on a numbered slate with their eyes shut.(American Heritage® Dictionary of the English Language, Fourth Edition)