refinement

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

• “they performed with great polish”
• “I admired the exquisite refinement of his prose”
• “almost an inspiration which gives to all work that finish which is almost art” -Joseph Conrad

the result of improving something

• “he described a refinement of this technique”

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

a subtle difference in meaning or opinion or attitude

• “without understanding the finer nuances you can”
• “;”
• “t argue about shades of meaning”

the quality of excellence in thought and manners and taste

• “a man of intellectual refinement”
• “he is remembered for his generosity and civilization”