/ waʊ; NAmE / exclamation , verb , noun
■ exclamation
(also wowee / ˌwaʊˈiː; NAmE /) ( informal ) used to express great surprise or admiration :
Wow! You look terrific!
■ verb
[ vn ] wow sb (with sth) ( informal ) to impress sb very much, especially with a performance :
He wowed audiences around the country with his new show.
■ noun
1.
[ sing. ] ( informal ) a great success :
Don't worry. You'll be a wow.
2.
[ U ] ( technical ) gradual changes in the pitch of sound played on a record or tape
—compare flutter
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WORD ORIGIN
sense 1 natural exclamation: first recorded in Scots in the early 16th cent.
sense 2 1930s: imitative.