biennium
noun
                                                                                                                            
                                                            bi·en·ni·um
                    
                                                                                                              
                                                                                                                                  bī-ˈe-nē-əm  
                                                      
                                                          
            
            
               plural bienniums or biennia
                                        bī-ˈe-nē-ə  
    
            
        
    
                                
              
          
                                                      : a period of two years                                      
                
                    
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  Merriam-Webster unabridged




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