pactum

Originally from pacīscor (“to arrange by negotiation”), from Proto-Indo-European *peh₂ḱ- (“to fix; settle”), whence also pāx (“peace”). Not easily distinguishable from Etymology 2 already in Proto-Indo-European, which might reflect an eventual merger of a split outcome of the same root.

• (Classical Latin) IPA^(key): [ˈpak.tũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈpak.tum]
• Uncertainty about derivation likely entailed variation in the length of the /a/; however, vowel reduction in compectum indicates that it was originally short.

pactum n (genitive pactī); second declension

1. an agreement, bargain, pact

   Synonyms: compositum, condiciō, stipulātiō

   Near-synonym: foedus

2. (in adverbial expressions) a means, manner, method, consideration

   Synonyms: modus, ratiō, via

   quō pactō possum vīvere sī..? ― how can I live when..?

   • 27 BCE – 25 BCE, Titus Livius, Ab Urbe Condita 1.32:

     quo pacto ius nostrum adipiscamur

     how we may obtain our right

   • 63 BCE, Cicero, Catiline Orations 1.17:

     Servi mehercule mei si me isto pacto metuerent ut te metuunt omnes cives tui, domum meam relinquendam putarem.

     If my servants feared me in such a manner as all your countrymen fear you, I should think that I need to leave my house.

Second-declension noun (neuter).

• pactus, -ūs (Late Latin)

pactum

1. inflection of pactus (“arranged by negotiation, agreed”):
   1. accusative masculine singular
   2. nominative/accusative/vocative neuter singular

See the etymology of the corresponding lemma form.

• (Classical Latin) IPA^(key): [ˈpaːk.tũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈpak.tum]

pāctum

1. inflection of pāctus (“fixed, fastened”):
   1. accusative masculine singular
   2. nominative/accusative/vocative neuter singular

• “pango, pago, paco” in volume 10, part 1, column 203, line 13 in the Thesaurus Linguae Latinae (TLL Open Access), Berlin (formerly Leipzig): De Gruyter (formerly Teubner), 1900–present
• “pactum; pactus” on page 1410 of the Oxford Latin Dictionary (2nd ed., 2012)
• De Vaan, Michiel (2008), “pangō; pāx”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 442; 452

• “pactum”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “pactum”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
• "pactum", 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)
• “pactum”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.