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adventive

[ad-ven-tiv]Botany, Zoology
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adjective
  1. not native and usually not yet well established, as exotic plants or animals.
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noun
  1. an adventive plant or animal.
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Origin of adventive

1595–1605, for an earlier sense; < Latin advent(us) advance, incursion (see advent) + -ive
Related formsad·ven·tive·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for adventive

adventive

adjective
  1. (of a species) introduced to a new area and not yet established there; exotic
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noun
  1. such a plant or animal
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Abbreviation: casual
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adventive in Science

adventive

[ăd-vĕntĭv]
  1. Not native to and not fully established in a new habitat or environment. An adventive plant may be locally or temporarily naturalized without finding conditions that allow it to spread more widely.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.