WordNet

a large indefinite number; "he faced a myriad of details"
too numerous to be counted; "incalculable riches"; "countless hours"; "an infinite number of reasons"; "innumerable difficulties"; "the multitudinous seas"; "myriad stars"; "untold thousands" (同)infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable

PrepTutorEJDIC

無数 / 《古》1万 / 無数の
数えきれないほどの無数の(innumerable)
種々雑多な,いろいろ混じった
『無数の』,数えきれないほどの(countless)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/08/10 09:04:34」(JST)

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For other uses, see Myriad (disambiguation).

Look up myriad in Wiktionary, the free dictionary.

Myriad (Ancient Greek: μύριος, μυριάδες (myrios, plural myriades), "numberless, countless, infinite", is a classical Greek word for the number 10,000. In modern English, the word refers to an unspecified large quantity.

History and usage

Main article: 10000 (number)

A myriad is primarily a singular cardinal number; just as the "thousand" in "four thousand" is singular (one does not write "four thousands people") the word myriad is used in the same way: "there are four myriad people outside". When used as a noun, meaning "a large number", it follows the same rules as that phrase. However, that is not the case originally in Greek, where there is plural.

In English, the term "myriad" is most commonly used to refer to a large number of an unspecified size. In this way "myriad" can be used as either a noun or an adjective.^[1] Thus both "there are myriad people outside" and "there is a myriad of people outside" are correct.^[2]

Merriam-Webster notes, "Recent criticism of the use of myriad as a noun, both in the plural form myriads and in the phrase a myriad of, seems to reflect a mistaken belief that the word was originally and is still properly only an adjective.... however, the noun is in fact the older form, dating to the 16th century. The noun myriad has appeared in the works of such writers as Milton (plural myriads) and Thoreau (a myriad of), and it continues to occur frequently in reputable English."^[2]

The Western numbering system divides large numbers into groups of three digits, and so the names for such numbers follow this division (10,000 = ten thousand). East Asian numbering divides large numbers into groups of four; so in Chinese, Korean, or Japanese, 30,000 really would be "three myriad" (3,0000 - Chinese sān wàn (三萬/三万)) - Japanese san-man - Korean sahm mahn (삼만). One million is a hundred myriad (100 × 10000 instead of 1000 × 1000); the next uniquely named number after a myriad is 億 (Chinese pinyin yì, Japanese oku, Korean eok (억)), which is myriad myriad (10000 × 10000) or a hundred million.

Modern Greek still uses the word "myriad" by itself, but also to form the word for million. The word for million is ekatommyrio (hundred myriad — εκατομμύριο); one thousand million is disekatommyrio (twice hundred myriad — δισεκατομμύριο).

The largest number named in Ancient Greek was a myriad myriad and Archimedes of Syracuse used this quantity as the basis for a numeration system of large powers of ten, which he needed to count grains of sand, see The Sand Reckoner.

There is only slight indication that "myria" has at all been used as a metric prefix for 10,000, e.g., 10 kilometres = 1 myriametre. It does not have official status as an SI prefix.

In Sweden and Norway, one mile = 10,000 metres = one myriametre. Before they went metric, one Swedish mile was 10,688 metres and a Norwegian mile was 11,295 metres, so only a small change had to be made to the old mile to make them equal to one myriametre. Even today, both Swedes and Norwegians use the 10,000 metre mile ("mil") to refer to travel distances in everyday language.

In Great Britain, the Ordnance Survey use the term myriad to refer to a 100 km × 100 km area in the National Grid.

In other languages

Sinosphere

In the Sinosphere, words equivalent to Greek myriad (10,000) derive from the same Chinese character, "萬", or "万" in the simplified form. The pronunciations of this character vary across linguistic areas. In Mandarin Chinese, it is pronounced as wàn, while various sounds are associated with the same character in various dialects of the Chinese language including the Cantonese, Hakka, and Min Nan dialects. The Japanese pronunciation is man, the Korean, man (written as 만 in hangul), and the Vietnamese, vạn.

The Chinese, Japanese, and Korean languages also have words for a myriad squared (100,000,000): yì (億) (or wànwàn [萬萬] in ancient texts), oku (億), and eok (억/億), respectively. A myriad cubed (10,000³ or 10¹²) is a zhào (兆), chō (兆), and jo (조/兆); a myriad to the fourth power (10,000⁴ or 10¹⁶) is a jīng (京), kei (京), and gyeong (경/京), a myriad to the fifth power (10,000⁵ or 10²⁰) is a gai (垓), a myriad to the sixth power (10,000⁶ or 10²⁴) is a shi (秭), a myriad to the seventh power (10,000⁷ or 10²⁸) is a jō (穣), a myriad to the eighth power (10,000⁸ or 10³²) is a kō (溝), a myriad to the ninth power (10,000⁹ or 10³⁶) is a kan (澗), a myriad to the tenth power (10,000¹⁰ or 10⁴⁰) is a sē (正), respectively. Conversely, Chinese, Japanese, and Korean do not have single words for a thousand to the second, third, fifth power, etc., unlike English and many other European languages.

Other languages

Amharic: ′əlf (እልፍ)
Hebrew: revava (רבבה)
- Biblical Hebrew: "ribua" (ריבוא)
Malayalam: Ayutham (അയുതം)
Tamil: Mudivili
Telugu: Challa
Thai: meun (หมื่น)
Turkic: tümen
Mongolian: Tum (Түм)

References

^ "Myriad". merriam-webster.com. http://www.merriam-webster.com/dictionary/myriad.
^ ^a ^b "Myriad". webster.com. http://www.webster.com/cgi-bin/dictionary?sourceid=Mozilla-search&va=myriad.

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遺伝子特許に関する米国連邦最高裁判決の意義[Ass'n for Molecular Pathology (AMP) v. Myriad Genetics, Inc., 133 S. Ct. 2107, 186 L. Ed. 2d 124 (2013)]

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