millennium
noun
                                                                                                                            
                                                            mil·len·ni·um
                    
                                                                                                              
                                                                                                                                  mə-ˈle-nē-əm  
                                                      
                                                          
            
            
               plural millennia
                                        mə-ˈle-nē-ə  or millenniums
    
 or millenniums            
        
    1
                    
        a
    
          
                                          
              
          
                                                      : the thousand years mentioned in Revelation (see revelation sense 3) 20 during which holiness is to prevail and Christ is to reign on earth                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a period of great happiness or human perfection                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : a period of 1000 years                                      
                
                                
            especially                
          
                                                      : one reckoned from the beginning of the Christian era                                       
              
                             
            at the start of the third millennium    
                         
            
        b
    
          
                                          
              
          
                                                      : a 1000th anniversary or its celebration                                      
              
                             
In 2015 the city of Leipzig, Germany, celebrated its millennium.
                         
                
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  Merriam-Webster unabridged




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