refine

US /rɪˈfaɪn/
UK /rɪˈfaɪn/
"refine" picture
1.

remove impurities or unwanted elements from (a substance), typically as part of an industrial process.

:
The company uses advanced techniques to refine crude oil.
Sugar is refined to remove molasses and other impurities.
2.

improve (something) by making small changes, in particular make it more subtle and accurate.

:
She spent hours trying to refine her technique.
We need to refine our strategy to achieve better results.