- 1the time taken by a planet to make one revolution around the sun.
The length of the earth’s year depends on the manner of calculation. For ordinary purposes the important period is the solar year(also called astronomical year, equinoctial year, or tropical year), which is the time between successive spring or autumnal equinoxes, or winter or summer solstices, roughly 365 days, 5 hours, 48 minutes, and 46 seconds in length. This period thus marks the regular cycle of the seasons. See also sidereal year, anomalistic year
Old English gē(a)r, of Germanic origin; related to Dutch jaar and German Jahr, from an Indo-European root shared by Greek hōra 'season'