the quality of excellence in thought and manners and taste | the act of offering an improvement to replace a mistake; setting right |
a subtle difference in meaning or opinion or attitude | determination of the length of a curve; finding a straight line equal in length to a given curve |
the result of improving something | the conversion of alternating current to direct current |
the process of removing impurities (as from oil or metals or sugar etc.) | (chemistry) the process of refinement or purification of a substance by distillation |
a highly developed state of perfection; having a flawless or impeccable quality | |