portio

Traditionally related to the same root as pars, parcus, and parcō. These terms stem from the Proto-Indo-European root *per- (“sell”), which also gave the Ancient Greek πόρνη (pórnē, “prostitute”), and πέρνημι (pérnēmi, “sell”).

De Vaan offers an alternative etymology where portiō would instead be a dissimilated and syncopated compound of prō +‎ ratiō: prō ratiōne > prōrtiōne > portiōne, an adverbial phrase from which the noun portiō would be back-formed.[1] If this etymology is correct, portiō would be unrelated to pars.

• (Classical) IPA^(key): /ˈpor.ti.oː/, [ˈpɔrt̪ioː]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈpor.t͡si.o/, [ˈpɔrt̪͡s̪io]

portiō f (genitive portiōnis); third declension

1. share, part, portion
   • 27 BCE – 25 BCE, Titus Livius, Ab Urbe Condita 6.35.4:

     Creātīque tribūnī C. Licinius et L. Sextius prōmulgāvēre lēgēs omnēs adversus opēs patriciōrum et prō commodīs plēbis: ūnam dē aere aliēnō, ut dēductō eō dē capite, quod ūsūrīs pernumerātum esset, id, quod superesset, trienniō aequīs portiōnibus persolverētur.

2. relation, proportion

Third-declension noun.

• portiōnālis
• portiuncula
• prōportiō

• pars

• “portio”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “portio”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• portio 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)
• portio in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• “portion”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.