Introduced species (Biology Glossary)

Introduced species : Also called an exotic species, foreign species, alien species, non-native species, or non-indigenous species.
Any species living outside its native geographic range, and which has arrived there either by accidental or deliberate human activity. Such human-caused introduction of species to foreign environments is distinguished from biological colonization, by which species spread to new areas through “natural” means (i.e. without the involvement of humans).