lasting for an indefinitely long time; enduring: her perennial beauty.
(of plants) having a life cycle lasting more than two years.
lasting or continuing throughout the entire year, as a stream.
perpetual; everlasting; continuing; recurrent.
a perennial plant: Daffodils and tulips are perennials.
something that is continuing or recurrent.

1635–45; < Latin perenni(s) lasting the whole year through (per- per- + -enn-, combining form of annus year + -is adj. suffix) + -al1

perenniality, noun
perennially, adverb

annual, perennial.

1. perdurable; constant, incessant, continual. 4. imperishable, undying, eternal, immortal. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perennial (pəˈrɛnɪəl)
1.  lasting throughout the year or through many years
2.  everlasting; perpetual
3.  annual Compare biennial a woody or herbaceous plant that can continue its growth for at least two years
[C17: from Latin perennis continual, from per through + 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

1644, "evergreen," formed in Eng. from L. perennis "lasting through the year (or years)," from per- "through" + annus "year" (see annual). Botanical sense of "Remaining alive through a number of years" is attested from 1672; fig. meaning of "enduring, permanent" is from 1750.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
perennial  [%PREMIUM_LINK%]     (pə-rěn'ē-əl)  Pronunciation Key 
Adjective   Living for three or more years.

Noun   A perennial plant. Herbaceous perennials survive winter and drought as underground roots, rhizomes, bulbs, corms, or tubers. Woody perennials, including vines, shrubs, and trees, usually stop growing during winter and drought. Asters, irises, tulips, and peonies are familiar garden perennials. Compare annual, biennial.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Biotechnologists are converting annual crops into perennial ones, eliminating
  the need for yearly planting.
The word is a perennial issue in English usage.
The debate is as fierce and perennial as the surf pounding the Alaska coastline.
With perennial weeds, seeds aren't the only problem, since they produce fewer
  of them.
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