(education) The annual period during which a student attends school, college or university.

The year adopted by any nation for the computation of time.

The time taken for the Earth to complete one revolution with respect to its apsides, usually defined as the time between perihelion passages.

(astronomy, historical) One complete precession of the equinox, approximately 25,765 years. / (astronomy, historical) Any real or imagined cycle with astronomical or astrological significance.

(hydrology) The timespan between October 1 and September 30 of the next year, differing from the calendar year because part of the precipitation that falls in late autumn and winter accumulates as snow and does not drain until the following spring or summer.

A year of rest for the land observed every seven years in ancient Judea, which included allowing the fields to lie without tilling, sowing, or reaping from one autumn to the next in accordance with a Levitical commandment.

Alternative spelling of yearlong.

Alternative spelling of yearlong.

(biology) A year in which salmon return to spawn in a particular river

An informal competition among birdwatchers to determine who can see or hear the largest number of species of birds within a single calendar year and within a specific geographical area.