diurnum

Substantivization of diurnus (“day”, relational adjective). Documented from the fourth century AD.[1]

• (Classical) IPA^(key): /diˈur.num/, [d̪iˈʊrnʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /diˈur.num/, [d̪iˈurnum]

diurnum n (genitive diurnī); second declension (Late Latin)

1. day (specifically the time when the sun is up)

Second-declension noun (neuter).

• Italo-Romance:
  • Corsican: ghjornu
  • Italian: giorno
  • Neapolitan: juorno
  • Sicilian: jornu
• Padanian:
  • Ligurian: giórno
  • Venetian: zorno, giorno
• Gallo-Romance:
  • Catalan: jorn
  • Franco-Provençal: jorn
  • Old French: jor (see there for further descendants)
  • Old Occitan: jorn
    • Occitan: jorn

diurnum

1. inflection of diurnus:
   1. masculine accusative singular
   2. neuter nominative/accusative/vocative singular

• diurnum 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)