myriad

n. great number of persons or things, many, a lot, composed of a countless number of items; ten thousand

Myriad is a classical Greek name for the number 104 = 10 000. In modern English the word refers to an unspecified large quantity.The term myriad is a progression in the commonly used system of describing numbers using tens and hundreds. Small numbers are named in terms of number of tens plus the remainder; for example 76 is seven tens plus six. Numbers larger than ten tens require a new description, a hundred. Thus, 1776 is seventeen hundred and seventy six. Similarly one hundred hundred is a myriad. A myriad myriad, or one hundred million, was left as the largest named number by the Ancient Greeks and is also the largest named number in the Bible.
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Noun
1. a large indefinite number; "he faced a myriad of details"
(hypernym) large indefinite quantity, large indefinite amount
2. the cardinal number that is the product of ten and one thousand
(synonym) ten thousand, 10000
(hypernym) large integer
Adjective
1. too numerous to be counted; "incalculable riches"; "countless hours"; "an infinite number of reasons"; "innumerable difficulties"; "the multitudinous seas"; "myriad stars"; "untold thousands"
(synonym) countless, infinite, innumerable, innumerous, myriad(a), multitudinous, numberless, uncounted, unnumberable, unnumbered, unnumerable
(similar) incalculable

(n.)
The number of ten thousand; ten thousand persons or things.
  

(n.)
An immense number; a very great many; an indefinitely large number.
  

(a.)
Consisting of a very great, but indefinite, number; as, myriad stars.
  

myriad