Meaning of “refine” - Learner’s Dictionary

refine

verb [ T ] uk us /rɪˈfaɪn/
MAKE PURE

to make a substance pure by removing other substances from it

IMPROVE

to improve an idea, method, system, etc by making small changes:

The engineers spent months refining the software.

(Definition of “refine” from the Cambridge Learner’s Dictionary © Cambridge University Press)