adventive

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adventive

(ăd-vĕn′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.

ad·ven′tive·ly adv.

Adventive

Ecology Referring to an organism which is not native to an ecosystem.
Psychology Referring to a unique facet or anomaly in one's life history which did not follow the usual “trajectory”.