Definition of fad noun from the Oxford Advanced Learner's Dictionary

 

fad

 noun
noun
BrE BrE//fæd//
 
; NAmE NAmE//fæd//
 
The fashion world, Showing interest
 
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something that people are interested in for only a short period of time synonym craze the latest/current fad a fad for physical fitness Rap music proved to be more than just a passing fad. See related entries: The fashion world, Showing interest Word Origin mid 19th cent. (originally dialect): probably the second element of fidfad, contraction of fiddle-faddle. Compare with faddy.Extra examples the fad for cookery programmes the fad for cosmetic surgery Fads for vitamin supplements have been overtaken by a vogue for minerals and trace elements. It’s just a fad. It won’t last. Rap music proved to be more than just a passing fad. These fads come and go.
See the Oxford Advanced American Dictionary entry: fad