refinement - noun

a highly developed state of perfection; having a flawless or impeccable quality

the result of improving something

the process of removing impurities (as from oil or metals or sugar etc.)

a subtle difference in meaning or opinion or attitude

the quality of excellence in thought and manners and taste

refinement - thesaurus

civilisation   civilization   cultivation   culture   elaboration   finish   nicety   nuance   polish   purification   refining   shade   subtlety