1) COMB: COMB in ADJ -based combines with nouns referring to places to mean something positioned or existing mainly in the place mentioned, or operating or organized from that place.

...a Washington-based organization.

...land-based missiles...

...American-based companies.

2) COMB: COMB in ADJ -based combines with nouns to mean that the thing mentioned is a central part or feature.

...computer-based jobs.

...oil-based sauces.

3) COMB: COMB in ADJ-GRADED -based combines with adverbs to mean having a particular kind of basis.

There are growing signs of more broadly-based popular unrest.

English dictionary. 2008.

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