octoとは 意味・読み方・使い方

別の表記

• Symbol: VIII

語源

Inherited from Proto-Italic *oktō, from Proto-Indo-European *oḱtṓw. Cognates include Sanskrit अष्ट (aṣṭa), Ancient Greek ὀκτώ (oktṓ), Gothic 𐌰𐌷𐍄𐌰𐌿 (ahtau) and 古期英語 eahta (English eight). Rubenbauer/Hofmann argue the form seems to stem from a PIE dual ("two times four fingertips" in a base-4 system).

発音

• (Classical Latin) IPA: [ˈɔk.toː]
• (modern Italianate Ecclesiastical) IPA: [ˈɔk.t̪o]

数詞

octō (indeclinable)

1. eight; 8
   • c. 37 BCE – 30 BCE, Virgil, Georgics 1.171:

     huic a stirpe pedes temo protentus in octo,
     binae aures, duplici aptantur dentalia dorso.

     then nigh the root / A pole eight feet projecting, earth-boards twain, / And share-beam with its double back they fix

   • c. 370 CE, Eutropius, Breviarium historiae romanae 2.2:

     T. etiam Quintius Cincinnatus Praenestinos, qui usque ad urbis Romae portas cum bello venerant, persecutus ad flumen Alliam vicit, octo civitates, quae sub ipsis agebant, Romanis adiunxit, ipsum Praeneste adgressus in deditionem accepit.

     Titus Quintius Cincinnatus, also, having pursued the Praenestini, who had advanced in a hostile manner to the very gates of Rome, defeated them on the river Allia, annexing eight cities that were under their dominion to the Roman empire; and, attacking Praeneste itself, forced it to surrender.

   • 405 CE, Jerome, Vulgate Regum II.22.1:

     octo annorum erat Iosias cum regnare coepisset et triginta uno anno regnavit in Hierusalem

     Josiah was eight years old when he began to reign, and he reigned thirty and one years in Jerusalem.

派生語

関連する語

• octās
• octōgintā

派生した語

参考

• Appendix:Latin cardinal numerals

参照

• “octo”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “octo”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
• “octo”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.
• Rubenbauer, H., Hofmann, J. B., Heine, R. "Lateinische Grammatik", p.26.