Etymology
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wow (interj.)

1510s, Scottish, a natural expression of amazement. "This old interjection had a new popularity in the early 1900s and again during the 1960s and later" [DAS].

wow (v.)

"overwhelm with delight or amazement," 1924, American English slang, from wow (interj.). Related: Wowed; wowing. Used as a noun meaning "unqualified success" since 1920.

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Definitions of wow
1
wow (v.)
impress greatly;
The speaker wowed the audience
2
wow (n.)
a joke that seems extremely funny;
Synonyms: belly laugh / sidesplitter / howler / thigh-slapper / scream / riot
From wordnet.princeton.edu