The term "biological invasion" is used to describe the 
process involving the intentional or unintentional transport or 
movement of a species outside its natural range by human 
activities and its introduction to new regions, where it may 
become established and spread.
THE THEMATIC ASSESSMENT REPORT ON INVASIVE ALIEN SPECIES AND THEIR CONTRO
The thematic assessment report on
INVASIVE ALIEN SPECIES
AND THEIR CONTROL
DEFINITIONS, CONCEPTS
AND THE CONTEXT OF 
THE ASSESSMENT