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accounting year
civil year
The year adopted by any nation for the computation of time.
academic year
(education) The annual period during which a student attends school, college or university.
Great 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.
anomalistic year
The time taken for the Earth to complete one revolution with respect to its apsides, usually defined as the time between perihelion passages.
water year
(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.
year-groups
plural of year-group
pack-year
(medicine, smoking) A unit for measuring the number of cigarettes a person has smoked previously; it is calculated by multiplying the average number of packs of cigarettes the person smokes per day by the number of years the person has smoked.
big year
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.
half-year
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)
