yearly

adj. occurring every year; continuing for a year

adv. once a year, every year, annually; throughout the year

A year (from Old English gēr) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit.
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Adjective
1. occurring or payable every year; "an annual trip to Paris"; "yearly medical examinations"; "annual (or yearly) income"
(synonym) annual
(pertainym) year, twelvemonth, yr
Adverb
1. without missing a year; "they travel to China annually"
(synonym) annually, every year, each year

(adv.)
Annually; once a year to year; as, blessings yearly bestowed.
  

(a.)
Lasting a year; as, a yearly plant.
  

(a.)
Happening, accruing, or coming every year; annual; as, a yearly income; a yearly feast.
  

(a.)
Accomplished in a year; as, the yearly circuit, or revolution, of the earth.
  

Yearlong