Webster's English Dictionary

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refine

re.fine \ri-'fi-n\ vt 1: to reduce to a pure state {~ sugar}  2: to free 
   from moral imperfection : ELEVATE  3: to improve or perfect by pruning or 
   polishing  4: to free from what is coarse, vulgar, or uncouth  1: to become 
   pure or perfected  2: to make improvement by introducing subleties or 
   distinctions  - re.fin.er n