year in WordNet English dictionary

1. a body of students who graduate together
   "the class of '97"; "she was in my year at Hoehandle High"
   class  year 
   
2. a period of time containing 365 (or 366) days
   "she is 4 years old"; "in the year 1920"
   year  twelvemonth  yr 
   
3. the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun
   "a Martian year takes 687 of our days"
   year 
   
4. a period of time occupying a regular part of a calendar year that is used for some particular activity
   "a school year"
   year