Alternative spelling of yearlong.

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

(Britain, accounting) Synonym of fiscal year

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

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

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

(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.

The period of time equal to half a year; normally referred to as 6 months, but a half-year is more exactly 182.5 days (without a leap day)

In the Jewish calendar, a year of 355 days or a leap year of 385 days; perfect year.

(astronomy) Great Year; one complete precession of the equinoxes, approximately 25,765 years.