n.
1.
Clarification, purification, filtration, defecation, sublimation.
2.
Improvement.
3.
Elegance, polish, purity, delicacy, cultivation, civility, civilization, culture, politeness, gentility, good-breeding.
4.
Subtilty, nicety, fineness, delicacy.
5.
Subtilty, finesse, sophistry, artifice, nicety.