1. A period of time containing 365 (or 366) days
   "she is 4 years old"; "in the year 1920";
   - twelvemonth [archaic], yr
    
2. A period of time occupying a regular part of a calendar year that is used for some particular activity
   "a school year"
    
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"
    
4. A body of students who graduate together
   "she was in my year at Hoehandle High";
   - class

Type of: assemblage, gathering, period, period of time, time period, time span

Part of: decade, decennary [archaic], decennium

Encyclopedia: Year, Christian