From Longman Dictionary of Contemporary Englishwowwow1 /waʊ/ ●○○ interjection informal IMPRESSused when you think something is very impressive or surprising Wow! Look at that!
Examples from the Corpus
wow• Wow! That's a great car!wowwow2 verb [transitive] informalIMPRESS to make people admire you a lot SYN impress The show has wowed audiences all over the country.→ See Verb tableExamples from the Corpus
wow• After 17 years, the band continues to wow audiences.• Read in studio Four visiting musicians from Czechoslovakia have been wowing drinkers in a local pub.• She spent many evenings watching Jamie, whose scathingly political drag show was wowing the entire circuit.• Some may even love all those silly electronic gizmos you want to wow them with.wowwow3 noun [singular] informal 1 SUCCESSFULa great success2 → the wow factorExamples from the Corpus
wow• For the Cosmo Girl, life is a wow!• That one against Notre Dame, that one was a wow.Origin wow1 (1500-1600) Natural sound 