1
                    
                                          
              
          
                                                      : the period beginning four Sundays before Christmas and observed by some Christians as a season of prayer and fasting                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : the coming of Christ at the Incarnation (see incarnation sense 3b(1))                                      
                
                    
        b
    
          3
                    
                                not capitalized                                  
              
          
                                                      : a coming into being or use                                      
              
                             
the advent of spring
                                       the advent of pasteurization
                                       the advent of personal computers
                         
                
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  Merriam-Webster unabridged




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