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.

1350–1400; < Late Latin annuālis, equivalent to Latin annu(us) yearly (derivative of annus circuit of the sun, year) + -ālis -al1; replacing Middle English annuel < Anglo-French < Latin

annually, adverb
interannual, adjective
interannually, adverb

1. anal, annual, annul ; 2. annual, perennial. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To annual
World English Dictionary
annual (ˈænjʊəl)
1.  occurring, done, etc, once a year or every year; yearly: an annual income
2.  lasting for a year: an annual subscription
3.  perennial Compare biennial a plant that completes its life cycle in less than one year
4.  a book, magazine, etc, published once every year
[C14: from Late Latin annuālis, from Latin annuus yearly, from annus year]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. annuel, from L.L. annualem (nom. annualis), corresponding to L. annalis as adjective form of annus "year," from PIE *at-no-, from base *at- "to go," on notion of "period gone through" (cf. Skt. atati "goes, wanders," Goth. aþnam (dat. pl.) "year," Oscan akno- "year, holiday,
time of offering"). Used of plants since 1710.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
annual  [%PREMIUM_LINK%]     (ān'y-əl)  Pronunciation Key 
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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He was said to be in outstanding physical condition, and like every member of
  the force, he had to undergo an annual physical.
Today it has more than 50000 head of cattle and an annual production of at
  least 10 million pounds of beef.
To bloom, a clivia needs to be on an annual cycle of warm and cool temperatures.
This meeting was well attended and indicated clearly that such a meeting should
  be held annually.
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