Longman Dictionary of Contemporary English homepage

based

adjective
     
based
1 [not before noun] if you are based somewhere, that is the place where you work or where your main business is:
It is a professional service based at our offices in Oxford.
London-based/New York-based etc
a London-based firm of accountants
2

oil-based/carbon-based/computer-based etc

used to describe the basic feature or part of something:
computer-based teaching
community-based services
carbon-based fuels
3

broadly-based

based on many kinds of things or people:
a broadly-based government of national reconciliation

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