/ beɪst; NAmE / adjective [ not before noun ]
1.
based (on sth) if one thing is based on another, it uses it or is developed from it :
The movie is based on a real-life incident.
The report is based on figures from six different European cities.
2.
(also in compounds) if a person or business is based in a particular place, that is where they live or work, or where the work of the business is done :
We're based in Chicago.
a Chicago-based company
3.
-based (in compounds) containing sth as an important part or feature :
lead-based paints
a class-based society
—see also broad-based