refine

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re|fine /rɪf'aɪn/ (refines refining refined)
1 [VERB] usu passive, be V-ed
When a substance is refined, it is made pure by having all other substances removed from it.
Oil is refined to remove naturally occurring impurities.
● refining [N-UNCOUNT]
...oil refining.
2 [VERB] usu passive, be V-ed
If something such as a process, theory, or machine is refined, it is improved by having small changes made to it.
Surgical techniques are constantly being refined.
= improve

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