wow1 / wou/ inf. • interj. (also wow·ee / ˈwouē; ˈwouˈ(w)ē/ ) expressing astonishment or admiration: “Wow!” he cried enthusiastically.• n. a sensational success: your play's a wow.• v. [tr.] impress and excite (someone) greatly: they wowed audiences on their recent British tour.wow2 • n. slow pitch fluctuation in sound reproduction, perceptible in long notes. Compare with flutter (sense 1).