Longman Dictionary of Contemporary English homepage

base

1 verb
     
base1 S1 W1
[transitive usually passive] to have your main place of work, business etc in a particular place:
The paper had intended to base itself in London.
be based in something
The new organization will be based in Dallas.
➔ based

base something on/upon something

phrasal verb
to use something as the thing from which something else is developed:
Their relationship was based upon mutual respect.
an economy based on farming
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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