octennis

From octō (“eight”) +‎ annus (“year”) +‎ -is (forming compound adjectives).

• (Classical Latin) IPA^(key): [ɔkˈtɛn.nɪs]
• (modern Italianate Ecclesiastical) IPA^(key): [okˈtɛn.nis]

octennis (neuter octenne); third-declension two-termination adjective (only attested post-classically)

1. eight-year-old
   • 380 CE – 392 CE, Ammianus Marcellinus, Res Gestae XVIII.vi.10:

     Qua causa ne occuparentur itinera, celeri cursu praegressi cum ad secundum lapidem venissemus, liberali forma puerum torquatum, ut coniectabamus octennem, in aggeris medio vidimus heiulantem, ingenui cuiusdam filium, ut aiebat; quem mater dum inminentium hostium terrore percita fugeret, inpeditior trepidando reliquerat solum. Hunc dum imperatu ducis miserati commotique inpositum equo prae me ferens ad civitatem reduco, circumvallato murorum ambitu praedatores latius vagabantur.

     (please add an English translation of this quotation)

2. of eight years, lasting eight years

   Synonym: octennālis

   (Can we add an example for this sense?)

Third-declension two-termination adjective.

• Italian: ottenne

• “octennis”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “octennis”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.