bi·o·di·ver·si·ty

[bahy-oh-di-vur-si-tee, ‐dahy‐]
noun
diversity among and within plant and animal species in an environment.

Origin:
1985–90, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
biodiversity (ˌbaɪəʊdaɪˈvɜːsɪtɪ) [Click for IPA pronunciation guide]
 
n
the existence of a wide variety of plant and animal species in their natural environments, which is the aim of conservationists concerned about the indiscriminate destruction of rainforests and other habitats

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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00:10
Biodiversity has a plethora of syllables.
So is supercalifragilisticexpialidocious. Does it mean:
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
(used as a nonsense word by children to express approval or to represent the longest word in English.)
Etymonline
Word Origin & History

biodiversity
by 1988, from bio- + diversity.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
biodiversity   (bī'ō-dĭ-vûr'sĭ-tē)  Pronunciation Key 
The number, variety, and genetic variation of different organisms found within a specified geographic region.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

biodiversity definition


A term that describes the number of different species that live within a particular ecosystem.

Note: The preservation of biodiversity is considered by environmentalists to be a major goal of environmental policy.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
In this article the health and biodiversity issues are not seriously taken into
  consideration.
The new networks will speed up the cataloging of the awesome biodiversity of
  the oceans.
Eco-tourists flock to the region for its incomparable biodiversity and exotic
  beauty.
The first is the country's huge biodiversity, with dozens of microclimates.
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