1
                    
        a
    
          
                                          
              
          
                                                      : the period of about 3651/4 solar days required for one revolution of the earth around the sun                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the time required for the apparent sun to return to an arbitrary fixed or moving reference point in the sky                                      
                
                    
        c
    
          
                                          
              
          
                                                      : the time in which a planet completes a revolution about the sun                                      
              
                             
two Mercury years
                         
                
                    2
                    
        a
    
          
                                          
              
          
                                                      : a cycle in the Gregorian calendar of 365 or 366 days divided into 12 months beginning with January and ending with December                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a period of time equal to one year of the Gregorian calendar but beginning at a different time                                      
                
                    
3
                    
                                          
              
          
                                                      : a calendar year specified usually by a number                                      
              
                             
died in the year 1900
                         
                
                    4
                    
                                years  plural                                  
              
          
                                                      : a time or era having a special significance                                      
              
                             
their glory years
                         
                
                    5
                    
        a
    
          
                                          
              
          
                                                      : 12 months that constitute a measure of age or duration                                      
              
                             
her 21st year
                                       The twins are two years old.
                         
                
                  —often used in combinationtwo-year-old twins
a six-year-old dog
The winner is a 16-year-old from Kentucky.
    
                
                    
        b
    
          6
                    
                                          
              
          
                                                      : a period of time (such as the usually 9-month period in which a school is in session) other than a calendar year                                      
                
                    
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  Merriam-Webster unabridged




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