octavus

Latin

Latin ordinal numbers

<  7th	8th	9th  >
Cardinal : octo     Ordinal : octāvus     Adverbial : octiēs     Distributive : octōnī

Etymology

From Proto-Indo-European *oḱtṓwos, from *oḱtṓw, whence octō (“eight”).

Pronunciation

• (Classical Latin) IPA^(key): /okˈtaː.u̯us/, [ɔkˈt̪äːu̯ʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /okˈta.vus/, [okˈt̪äːvus]

Numeral

octāvus (feminine octāva, neuter octāvum); first/second-declension numeral

1. eighth; the ordinal number between septimus and nonus

Cardinal number: octo

Declension

First/second-declension adjective.

Number	Singular				Plural
Case / Gender	Masculine	Feminine	Neuter		Masculine	Feminine	Neuter
Nominative	octāvus	octāva	octāvum		octāvī	octāvae	octāva
Genitive	octāvī	octāvae	octāvī		octāvōrum	octāvārum	octāvōrum
Dative	octāvō		octāvō		octāvīs
Accusative	octāvum	octāvam	octāvum		octāvōs	octāvās	octāva
Ablative	octāvō	octāvā	octāvō		octāvīs
Vocative	octāve	octāva	octāvum		octāvī	octāvae	octāva

Derived terms

• octāvārius

Related terms

• octal
• octave
• Octavian
• Octavianus
• October
• octogenarian
• octopus
• octuple
• octuplet

Descendants

• Asturian: octavu
• English: octave
• French: octave
• Galician: oitavo
• Italian: ottavo
• Portuguese: oitavo
• Spanish: ochavo, octavo

References

• “octavus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “octavus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• octavus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• octavus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.