acellent Share definition Flag An adjective that describes something as brilliant, amazing, superior, one of a kind! A combination of "ace" and "excellent". "You did an acellent job!" "That chocolate cake was acellent!" "Your hair looks acellent!" acellent by Lisa Yu December 9, 2006 0 0 Get merch Get the acellent mug. Buy Now — $32.95 See more merch