The Oxford Thesaurus An A-Z Dictionary of Synonyms - refinev.

1) purify, cleanse, clear, clarify, decontaminate: They continued to refine the liquid till all the impurities were gone. 2) cultivate, civilize, polish, improve, elevate, perfect: He is trying to refine his speech by getting rid of his country accent. 3) hone, sharpen, concentrate, focus, subtilize: We ought to refine our argument for higher wages before approaching the management.