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

1595–1605, for an earlier sense; < Latin advent(us) advance, incursion (see advent) + -ive

adventively, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adventive (ədˈvɛntɪv)
1.  (of a species) introduced to a new area and not yet established there; exotic
2.  such a plant or animal

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
adventive   (ād-věn'tĭv)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Establish biological controls in targets adventive range.
The focus is on using natural enemies against adventive pests.
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