/ ˈmɪriəd; NAmE / noun
( literary ) an extremely large number of sth :
Designs are available in a myriad of colours.
► myr·iad adjective :
the myriad problems of modern life
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WORD ORIGIN
mid 16th cent. (referring to a unit of ten thousand): via late Latin from Greek murias , muriad- , from murioi 10,000.