tic-tac-toe
noun
            variants  
 or tick-tack-toe
        
    
                                
              
          
                                                      : a game in which two players alternately put Xs and Os in compartments of a figure formed by two vertical lines crossing two horizontal lines and each tries to get a row of three Xs or three Os before the opponent does                                      
                
                    
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  Merriam-Webster unabridged




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