Year n. : The time of the apparent revolution of the sun trough the ecliptic; the period occupied by the earth in making its revolution around the sun, called the astronomical year; also, a period more or less nearly agreeing with this, adopted by various nations as a measure of time, and called the civil year; as, the common lunar year of 354 days, still in use among the Mohammedans; the year of 360 days, etc. In common usage, the year consists of 365 days, and every fourth year (called bissextile, or leap year) of 366 days, a day being added to February on that year, on account of the excess above 365 days (see Bissextile).

Year n. : The time in which any planet completes a revolution about the sun; as, the year of Jupiter or of Saturn.

Year n. : Age, or old age; as, a man in years.

Example:
What high school Year is most important for class ranks?

Taxonomy
Earth, revolution, leap year, duration, symbol, Julian year, J2000.0, planets, sidereal year, respect to, Sun, Latin, of the Earth, orbit, eclipse year, annum, astronomical year, schools.

Defination from the web:
year (from Old English ȝēr; symbol y or sometimes a) is the amount of time it takes the Earth to make one revolution around the Sun. By ... Retrieved on 2009-01-09. "Annum (a) is used to denote year as a unit of measure; use a, ka, Ma, or Ga rather than year (or yr) kyr, Myr (or m.y.), or Gyr. ...