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of, for, or pertaining to a year; yearly:
annual salary.
occurring or returning once a year:
an annual celebration.
botany. living only one growing season, as beans or corn.
performed or executed during a year:
the annual course of the sun.
entomology. living or lasting but one season or year, as certain insects or colonies of insects.
botany. a plant living only one year or season.
a book, report, etc., published annually.
contemporary examples

“illegal aliens,” pearce told schumer, cost arizona more than $2.4 billion annually.
heated end for senate committee hearing on arizona immigration law terry greene sterling april 24, 2012

the tenth leading cause of death in the u.s., suicide accounts for nearly 35,000 deaths annually.
the most suicidal states the daily beast september 30, 2010

the number you quote is $2.2 billion spent annually in the u.s. alone in conjunction with lighting at night.
is light pollution the easiest environmental problem to fix? mindy farabee july 16, 2013

and in the last two years, rainfall, which averages 34 inches annually, has fallen at about half that rate.
oklahoma farmers find ways to cope while waiting for drought to end malcolm jones october 2, 2012

the organizations annually update topics such as hyperthermia, hypothermia and hyponatremia.
a runner’s guide to hydration (and how to not overdo it) dailyburn may 22, 2014

historical examples

this meeting has also been repeated annually ever since 1881.
the theory and practice of archery horace ford

mentioned coates with whom they did as much as 10,000 pieces annually.
a journey to america in 1834 robert heywood

it is considered that with facilities for irrigation andalusia could produce 150,000 bales annually.
encyclopaedia britannica, 11th edition, volume 7, slice 5 various

this malady was propagated annually by the parasitic spores.
fragments of science, v. 1-2 john tyndall

that community possessed a wide extent of rocky and barren pastures, leased annually by auction for the public good.
memoirs of the dukes of urbino, volume i (of 3) james dennistoun

adjective
occurring, done, etc, once a year or every year; yearly: an annual income
lasting for a year: an annual subscription
noun
a plant that completes its life cycle in less than one year compare perennial (sense 3), biennial (sense 3)
a book, magazine, etc, published once every year
adv.

1590s, from annual (adj.) + -ly (2).
adj.

late 14c., from old french annuel (12c.) or directly from late latin annualem (nominative annualis), corresponding to latin annalis as adjective form of annus “year,” from pie -at-no-, from root -at- “to go,” on notion of “period gone through” (cf. sanskrit atati “goes, wanders,” gothic aþnam (dative plural) “year,” oscan akno- “year, holiday, time of offering”). used of plants since 1710.
n.

c.1400, originally “service commemorating the anniversary of a person’s death,” from annual (adj.). by 1824 as short for annual plant.
annual
(ān’y-əl)
adjective completing a life cycle in one growing season.

noun an annual plant. annuals germinate, blossom, produce seed, and die in one growing season. they are common in environments with short growing seasons. most desert plants are annuals, germinating and flowering after rainfall. many common weeds, wild flowers, garden flowers, and vegetables are annuals. examples of annuals include tomatoes, corn, wheat, sunflowers, petunias, and zinnias. compare biennial, perennial.