perfectus

Learned borrowing from Latin perfectus.^[1] Doublet of parfait, perfect, and perfecto.

perfectus (plural perfecti)

1. (historical, Christianity) Synonym of perfect (“leader of the Cathar movement”).

From Proto-Italic *perifaktos. Perfect passive participle of perficiō, from per- (completive prefix) + faciō (“to do, make”). By surface analysis, per- +‎ factus.

• (Classical Latin) IPA^(key): [pɛrˈfɛk.tʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [perˈfɛk.tus]

perfectus (feminine perfecta, neuter perfectum); first/second-declension participle

1. finished; completed

   Synonyms: absolūtus, complētus

   Antonyms: imperfectus, infectus, incohātus

2. executed; carried out; performed

   Synonyms: factus, effectus

3. perfected; made exquisite
4. achieved; accomplished
5. caused; brought about

First/second-declension adjective.

perfectus (feminine perfecta, neuter perfectum, comparative perfectior, superlative perfectissimus, adverb perfectē); first/second-declension adjective

1. complete
2. perfect; excellent; exquisite
3. (of people) talented; accomplished (of very high skill)
4. (of inanimate objects and concepts) noble; virtuous
5. (Medieval Latin) righteous; honorable
6. (grammar) perfect (relating to the perfect tense)
7. (mathematics) perfect
   • Isidore of Seville, Etymologies 3.5.11:

     Perfectus numerus est, qui suis partibus adinpletur, ut senarius

     A perfect number is one which is the sum of its factors, like six

First/second-declension adjective.

From perficiō +‎ -tus (forming action nouns).

• perfectus:
  • (Classical Latin) IPA^(key): [pɛrˈfɛk.tʊs]
  • (modern Italianate Ecclesiastical) IPA^(key): [perˈfɛk.tus]
• perfectūs:
  • (Classical Latin) IPA^(key): [pɛrˈfɛk.tuːs]
  • (modern Italianate Ecclesiastical) IPA^(key): [perˈfɛk.tus]

perfectus m (genitive perfectūs); fourth declension (rare)

1. a doing; a making

Fourth-declension noun.

perfectūs

1. inflection of perfectus:
   1. nominative/accusative/vocative plural
   2. genitive singular

• “perfectus¹”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “perfectus²”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “perfectus¹”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
• “perfectus²”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
• "perfectus", in Charles du Fresne du Cange, Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• “perfectus”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.

Borrowed from Latin perfectus.

perfectus m

1. perfect (faultless, etc.)
   • circa 980, La Vie de Saint Léger

     Perfectus fud in caritet

     He was perfect in terms of charity

• The Vie de Saint Léger citation above is the only known recorded usage.