Definition of "Refinement" :
noun: the quality of excellence in thought and manners and taste
"A man of intellectual refinement."
noun: a subtle difference in meaning or opinion or attitude
noun: the result of improving something
"He described a refinement of this technique."
noun: the process of removing impurities (as from oil or metals or sugar etc.)
noun: a highly developed state of perfection; having a flawless or impeccable quality
"I admired the exquisite refinement of his prose."