WordNet sense 1 (the desired mineral that is left after impurities have been removed from mined ore):

dressed ore

WordNet sense 2 (direct one's attention on something):

center, focus, pore, rivet, centre

WordNet sense 3 (make central):

centralize, centralise

WordNet sense 4 (compress or concentrate):

condense, contract, contract

WordNet sense 5 (make more concise):

digest, digest

WordNet sense 6 (be cooked until very little liquid is left):

reduce, decoct, boil down