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Dozens : ウィキペディア英語版
Dozen

A dozen (commonly abbreviated doz or dz) is a grouping of twelve. The dozen may be one of the earliest primitive groupings, perhaps because there are approximately a dozen cycles of the moon or months in a cycle of the sun or year. Twelve is convenient because it has more divisors than other small numbers: 12 = 2 × 6 = 3 × 4 = 1 × 12. The use of twelve as a base number, known as the duodecimal system (also as ''dozenal''), probably originated in Mesopotamia (see also sexagesimal). This could come from counting on one's fingers by counting each finger bone with one's thumb. Using this method, one hand can count to twelve, and two hands can count to 144. Twelve dozen (122 = 144, the duodecimal 100) are known as a gross; and twelve gross (123 = 1,728, the duodecimal 1,000) are called a great gross, a term most often used when shipping or buying items in bulk. A great hundred, also known as a small gross, is 120 or ten dozen. A baker's dozen, also known as a big or long dozen, is 13.
==Etymology==
The English word ''dozen'' comes from the old form ''douzaine'', a French word meaning "a group of twelve" (''"Assemblage de choses de même nature au nombre de douze"'' — (translation: ''A group of twelve things of the same nature'' as defined in the eighth edition of the Dictionnaire de l'Académie française). This French word〔(【引用サイトリンク】Douzain, Douzaine, Douze, Douze-huit, Douzième, Douzièmement, Dox(o)-, Doxographe, Doxologie, Doyen )〕 is a derivation from the cardinal number ''douze'' ("twelve", from Latin ''duodĕcim'') and the collective suffix ''-aine'' (from Latin ''-ēna''), a suffix also used to form other words with similar meanings such as ''quinzaine'' (a group of fifteen), ''vingtaine'' (a group of twenty), ''centaine'' (a group of one hundred), etc. These French words have synonymous cognates in Spanish: ''docena'', ''quincena'', ''veintena'', ''centena'', etc. English ''dozen'', French ''douzaine'', Arabic durzen "درزن",German ''Dutzend'', Dutch ''dozijn'', Italian ''dozzina'' and Spanish ''docena'', are also used as indefinite quantifiers to mean "about twelve" or "many" (as in "a dozen times", "dozens of people").
A confusion may arise with the Anglo-Norman ''dizeyne'' (French ''dixaine'' or ''dizaine'') a tithing, or group of ten households〔.〕 — dating from the late Anglo-Saxon system of grouping households into tens and hundreds for the purposes of law, order and mutual surety (see Tithing). In some texts this 'dizeyne' may be rendered as 'dozen'.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Dozen」の詳細全文を読む



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