decennium
noun
                                                                                                                            
                                                            de·cen·ni·um
                    
                                                                                                              
                                                                                                                                  di-ˈse-nē-əm  
                                                      
                                                          
            
            
               plural decenniums or decennia
                                        di-ˈse-nē-ə  
    
            
        
    
                                
              
          
                                                      : a period of 10 years : decade                                      
                
                    
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  Merriam-Webster unabridged




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