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refine  vb 
1 to make or become free from impurities, sediment, or other foreign matter; purify 
2 to separate (a mixture) into pure constituents, as in an oil refinery 
3 to make or become free from coarse characteristics; make or become elegant or polished 
4 to remove (something impure or extraneous) 
5 to enlarge or improve (upon) by making subtle or fine distinctions 
6 to make (language) more subtle or polished 
 (C16: from re- + fine1) 
 refinable  adj 
 refiner  n