I. wow 1 /waʊ/ BrE AmE interjection informal
[ Date: 1500-1600 ; Origin: Natural sound ]
used when you think something is very impressive or surprising:
Wow! Look at that!
II. wow 2 BrE AmE verb [transitive]
informal to make people admire you a lot SYN impress :
The show has wowed audiences all over the country.
III. wow 3 BrE AmE noun [singular] informal
1 . a great success
2 . the wow factor an interesting, exciting, or unusual feature of something, that people will notice and think is very impressive