perfinitio

Probably per- (“completely”) +‎ fīnītiō (“a determining”, “an assigning”).

• (Classical Latin) IPA^(key): [pɛr.fiːˈniː.ti.oː]
• (modern Italianate Ecclesiastical) IPA^(key): [per.fiˈnit̪.t̪͡s̪i.o]

perfīnītiō f (genitive perfīnītiōnis); third declension

1. (Medieval Latin, law) a judgment, ruling, decision
   • 741–9, Lex Baiwariorum (1926), title XII, head viiii, pages 403–4:

     Emunda territorium meum usque ad legis perfinitionem.

     (please add an English translation of this quotation)

Third-declension noun.

• (a judgment, ruling, decision): dēfīnītiō, iūdicium (both Classical)

• Middle French: perfinition

• Charles du Fresne et al., Gloſſarium ad Scriptores Mediæ et Infimæ Latinitatis (a new edition, richer and enlarged), volume V (1734), column 385, “¶ Perfinitio”
• Jan Frederik Niermeyer, Mediae Latinitatis Lexicon Minus : Lexique Latin Médiéval–Français/Anglais : A Medieval Latin–French/English Dictionary, fascicle I (1976), page 788/1, “perfinitio”