refinement

noun

1. a highly developed state of perfection; having a flawless or impeccable quality"they performed with great polish"
2. the result of improving something"he described a refinement of this technique"
3. the process of removing impurities (as from oil or metals or sugar etc.)
4. a subtle difference in meaning or opinion or attitude"without understanding the finer nuances you can't enjoy the humor"
5. the quality of excellence in thought and manners and taste"a man of intellectual refinement"