Definition of “year”

noun

1.  Also called civil yearthe period of time, the calendar year, containing 365 days or in a leap year 366 days. It is based on the Gregorian calendar, being divided into 12 calendar months, and is reckoned from January 1 to December 31
2. a period of twelve months from any specified date, such as one based on the four seasons
3. a specific period of time, usually occupying a definite part or parts of a twelve-month period, used for some particular activity  ⇒ a school year 
4.  Also called astronomical yeartropical yearthe period of time, the solar year, during which the earth makes one revolution around the sun, measured between two successive vernal equinoxes: equal to 365.242 19 days
5. the period of time, the sidereal year, during which the earth makes one revolution around the sun, measured between two successive conjunctions of a particular distant star: equal to 365.256 36 days
6. the period of time, the lunar year, containing 12 lunar months and equal to 354.3671 days
7. the period of time taken by a specified planet to complete one revolution around the sun  ⇒ the Martian year 
8. (plural) age, esp old age  ⇒ a man of his years should be more careful 
9. (plural) time  ⇒ in years to come 
10. a group of pupils or students, who are taught or study together, divided into classes at school  ⇒ they are the best year we've ever had for history 
11. See the year dot
12. See year and a day
13. See year in, year out