[ri-noo, -nyoo]
able to be renewed: a library book that is not renewable.
something that is renewable.

1720–30; renew + -able

renewability, noun
nonrenewable, adjective
unrenewable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
renew (rɪˈnjuː)
1.  to take up again
2.  (also intr) to begin (an activity) again; recommence: to renew an attempt
3.  to restate or reaffirm (a promise, etc)
4.  (also intr) to make (a lease, licence, or contract) valid or effective for a further period
5.  to extend the period of loan of (a library book)
6.  to regain or recover (vigour, strength, activity, etc)
7.  to restore to a new or fresh condition
8.  to replace (an old or worn-out part or piece)
9.  to replenish (a supply, etc)

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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American Heritage
Science Dictionary
renewable   (rĭ-n'ə-bəl)  Pronunciation Key 
Relating to a natural resource, such as solar energy, water, or wood, that is never used up or that can be replaced by new growth. Resources that are dependent on regrowth can sometimes be depleted beyond the point of renewability, as when the deforestation of land leads to desertification or when a commercially valuable species is harvested to extinction. Pollution can also make a renewable resource such as water unusable in a particular location. Compare nonrenewable.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Renewable energy has received exceptional help from the government.
The position is a nine month appointment, renewable annually, with full
But nuclear power is not a complement to renewable energy, insist the greens.
The sources of the energy that people use the world over fall into two general
  categories: renewable and nonrenewable.
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