Myriad ( (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.
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. Thus both "there are myriad people outside" and "there is a myriad of people outside" are correct.
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."
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 - Japanese san-man - Chinese sān wàn (三萬/三万)) - 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 (Korean uk (억), Chinese pinyin yì, Japanese oku), 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.
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), 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.
This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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