the cardinal number that is the product of ten and one thousand
"Myriad, being a cardinal number equal to 10,000, was used in the ancient census to denote the exact population size of the city."
Ten thousand; 10,000
"The ancient text mentions that a myriad of soldiers marched across the desert."
too numerous to be counted
"countless hours"
"an infinite number of reasons"
"innumerable difficulties"
"the multitudinous seas"
"myriad stars"
Multifaceted, having innumerable elements
"The ancient city boasts a myriad of architectural styles that blend seamlessly across its winding streets."
The word "myriad" comes from the French myriade and Late Latin mȳriadem, which were borrowed from Ancient Greek. Originally, the Greek term meant a specific number of 10,000 before evolving to mean countless or infinite.