- year, twelvemonth, yr - a period of time containing 365 (or 366) days; "she is 4 years old"; "in the year 1920"
--1 is a kind of time period, period of time, period
--1 is a part of decade, decennary, decennium
--1 has particulars: - year - a period of time occupying a regular part of a calendar year that is used for some particular activity; "a school year"
--2 is a kind of time period, period of time, period
--2 has particulars: school year, academic year- year - the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; "a Martian year takes 687 of our days"
--3 is a kind of time period, period of time, period
--3 has parts: month; season, time of year
--3 has particulars:anomalistic year; solar year, tropical year, astronomical year, equinoctial year; lunar year; sidereal year - class, year - a body of students who graduate together; "the class of '97"; "she was in my year at Hoehandle High"
--4 is a kind of gathering, assemblage
--4 has particulars:graduating class; senior class; junior class; sophomore class; freshman class - year - the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; "a Martian year takes 687 of our days"