leap year
noun
1
                    
                                          
              
          
                                                      : a year in the Gregorian calendar containing 366 days with February 29 as the extra day                                      
                
                    
2
                    
                                          
              
          
                                                      : an intercalary year in any calendar                                      
                
                    
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  Merriam-Webster unabridged




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