Zest can mean pleasure and enthusiasm for something, the quality of being exciting and fun, or the outer skin of a citrus fruit. Learn how to use zest in different contexts and find out its origin and pronunciation. ZEST meaning: 1. enthusiasm, eagerness, energy, and interest: 2. the skin of an orange, lemon, or lime, used to…. Learn more. There are five meanings listed in OED's entry for the noun zest, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence. Zest is a kind of zeal or enthusiasm. If you've got a zest for something, you put your whole heart and soul into it. Dancers who have great zest leap, kick, and soar their way around the stage with a kind of joyful energy.