A myriad is a lot of something. If you’re talking about Ancient Greece, a myriad is ten thousand, but today you can use the word in myriad other ways.

Myriad comes from the Greek myrioi, the word for ten thousand, or less specifically, a countless amount. Myriad can be a noun, like a myriad of choices, or an adjective, like when you study myriad subjects in college. If you lift a rock you might find a myriad of bugs. Sticklers often look down their noses at using myriad as a noun, but that usage came first.

Definitions of myriad
  1. noun
    a large indefinite number
    “he faced a myriad of details”
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    type of:
    large indefinite amount, large indefinite quantity
    an indefinite quantity that is above the average in size or magnitude
  2. noun
    the cardinal number that is the product of ten and one thousand
    synonyms: 10000, ten thousand
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    type of:
    large integer
    an integer equal to or greater than ten
  3. adjective
    too numerous to be counted
    myriad stars”
    synonyms: countless, infinite, innumerable, innumerous, multitudinous, numberless, uncounted, unnumberable, unnumbered, unnumerable
    not capable of being computed or enumerated
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