Webster's English Dictionary

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wow

1. wow \'wau.\ ij : - used to express pleasure, surprise, or strong feeling 
2. wow n [1wow] : a striking success : HIT 
3. wow vt : to excite to enthusiastic admiration 
4. wow n [imit.] : a distortion in reproduced sound consisting of a slow 
   rise and fall of p itch caused by speed variation in the reproducing system