primogenitalis

Latin

prīmōgenitus (“first-born”) +‎ -ālis

(Classical Latin) IPA^(key): /priː.moː.ɡe.niˈtaː.lis/, [priːmoːɡɛnɪˈt̪äːlʲɪs̠]
(modern Italianate Ecclesiastical) IPA^(key): /pri.mo.d͡ʒe.niˈta.lis/, [primod͡ʒeniˈt̪äːlis]

prīmōgenitālis (neuter prīmōgenitāle); third-declension two-termination adjective

firstborn; primogenital
the first of all as to origin; original; primeval
- c. 3rd century, Tertullianus, chapter XX, in J[acques]-P[aul] Migne, editor, Adversus Valentinianos [Against the Valentinians]‎^[1], Latin edition, volume 2, quoted in Patrologiae cursus completus, Paris, published 1844, →OCLC, CPL 16, pages 523–594:
  unde et Sabbatum dictum est ab hebdomade sedis suae et Ogdoada mater Achamoth ab argumento ogdoadis primigenitalis.
  Whence he had the additional name of Sabbatum from the hebdomadal nature of his abode; his mother Achamoth, too, had the title Ogdoada, after the precedent of the primeval Ogdoad.[2]

Third-declension two-termination adjective.

	masc./fem.	neuter	masc./fem.	neuter
	singular		plural
nominative	prīmōgenitālis	prīmōgenitāle	prīmōgenitālēs	prīmōgenitālia
genitive	prīmōgenitālis		prīmōgenitālium
dative	prīmōgenitālī		prīmōgenitālibus
accusative	prīmōgenitālem	prīmōgenitāle	prīmōgenitālēs prīmōgenitālīs	prīmōgenitālia
ablative	prīmōgenitālī		prīmōgenitālibus
vocative	prīmōgenitālis	prīmōgenitāle	prīmōgenitālēs	prīmōgenitālia

“prīmōgĕnĭtālis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
"primogenitalis", 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)
prīmōgĕnĭtālis in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette, page 1,237/2.