wow wow /ˈwaʊ/

interjection

1. () Exclamations of admiration, often triggered by something impressive or astonishing.  ( jislaaik [South Africa] , coo [Informal, British] , wow )
   Exclamations of admiration, often triggered by something impressive or astonishing.
   

noun

1. A joke that seems extremely funny  ( belly laugh , howler , riot [Informal] , scream [Informal] , sidesplitter , thigh-slapper , wow )
   a joke that seems extremely funny
   

verb

1. Impress greatly  ( wow )
   impress greatly
    The speaker wowed the audience
   The speaker wowed the audience