wow1

 
Pronunciation: /waʊ/
informal

exclamation

  • (also wowee /waʊˈwiː/) expressing astonishment or admiration: ‘Wow!’ he cried enthusiastically

noun

  • a sensational success: your play’s a wow

verb

[with object]
  • impress and excite (someone) greatly: they wowed audiences on their recent British tour

Origin:

natural exclamation: first recorded in Scots in the early 16th century