/ fæd; NAmE / noun
something that people are interested in for only a short period of time
SYN craze :
the latest / current fad
a fad for physical fitness
Rap music proved to be more than just a passing fad .
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WORD ORIGIN
mid 19th cent. (originally dialect): probably the second element of fidfad , contraction of fiddle-faddle . Compare with faddy .