Definition
A species that is not native (or is alien) to the ecosystem under consideration and whose introduction harms, or is likely to harm, the environment, human health, and/or the economy.
Source(s)
Adapted from Asian Infrastructure Investment Bank (AIIB), "Environmental and Social Framework," 2021, View the PDF; Asian Development Bank (ADB), "Environment Safeguards: A Good Practice Sourcebook Draft Working Document," 2012, View the PDF.