| Some terms used in databases | ||
| Alien | Invasive | Non-Invasive |
| Introduced | ||
| Native | ||
| Exotic | ||
| Cryptogenic | ||
| adventive | ||
| feral | ||
| foreign | ||
| naturalised |
| Elements needed to rigorously define these terms | |
| Origin | |
| Outside polygon of interest | |
| Inside polygon of interest | |
| Not relevant | |
| Not known | |
| Human agent in range change? | |
| Yes | |
| No | |
| Not relevant | |
| Not known | |
| Not applicable | |
| Impact | |
| Has negative impact (at least sometimes) | |
| Does not have negative impact | |
| Not relevant | |
| Not known | |
| Establishment | |
| Established | |
| Not established | |
| Not relevant | |
| Not known | |
| Geographic Range | |
| Widespread and/or spreading | |
| Not widespread, not spreading | |
| Not relevant | |
| Not known | |
| Ecological Range | |
| Restricted to human-modified habitats | |
| Occurs in natural habitats | |
| Not relevant | |
| Not known |