[ad-ven-tiv] 
Botany, Zoology| 1. | not native and usually not yet well established, as exotic plants or animals. |
| 2. | an adventive plant or animal. |
| ad·ven·tive (ād-věn'tĭv) adj. Not native to and not fully established in a new habitat or environment; locally or temporarily naturalized: an adventive weed. n. An adventive organism. [From Latin adventus, arrival; see advent.] ad·ven'tive·ly adv. |
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