pars

From Proto-Italic *partis > parts > pars.

Probably from the same root as pār and portiō. This could be the Proto-Indo-European root *perH- or *per- (“sell, exchange”), which also gave the Ancient Greek πόρνη (pórnē, “prostitute”), and πέρνημι (pérnēmi, “sell”).

Others refer to (the perhaps identical) Proto-Indo-European *per- (“to pass through”), whence Latin porta, portus, parō, pariō, perīculum, experior, Ancient Greek πέρα (péra), πείρω (peírō), πόρος (póros), Proto-Germanic*faraną (“to go, to travel”) and *fērō (“danger”), whence English fare and fear, German fahren and Gefahr.

While keeping the separate root Proto-Indo-European *sperH-, that could also explain Latin parcus, parcō, Ancient Greek σπαρνός (sparnós), English spare.

pars f (genitive partis); third declension

a part, portion, piece, share [ quotations ▼]
(correlative) pars ... pars ..., some ... others ... [ quotations ▼] [ synonym ▲]
Synonym: partim
(usually in the plural) a party, fraction, side [ quotations ▼]
(theater, in the plural) a part, character
1. a part, function, office, duty
a lot, portion, fate
a portion or share of food
a task, lesson
a part, place, region of the earth
(mathematics) a part, fraction
a part of a body, a member
(politics, usually in the plural) a party
a direction [ quotations ▼]

Third-declension noun (i-stem, accusative singular in -em or -im, ablative singular in -e or -ī).