Meaning of “refinement” - Learner’s Dictionary

refinement

noun uk us /rɪˈfaɪnmənt/
IMPROVEMENT [ C, U ]

a small change that improves something:

Several refinements have been made to improve the car's performance.
POLITE [ U ]

polite behaviour and knowledge of social rules:

a woman of refinement
PURE [ U ]

the process of making a substance pure

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