Partial
late Middle English (in partial (sense 2 of the adjective)): from Old French parcial (partial (sense 2 of the adjective)), French partiel (partial (sense 1 of the adjective)), from late Latin partialis, from pars, part- ‘part’.
wiktionary
From Middle English partiall, parcial, from Old French parcial(“biased or particular”), from Late Latin partiālis(“of or pertaining to a part”), from Latin pars(“part”).
etymonline
partial (adj.)
late 14c., "not whole or total, incomplete;" early 15c., "one-sided, biased, inclined to favor one party in a cause or one side of a question more than the other," also "pertaining to a selfish interest rather than to a common or larger good," from Old French parcial (14c., Modern French partial) and directly from Medieval Latin partialis "divisible, solitary, partial," from Latin pars (genitive partis) "a part, piece, a share, a division" (from PIE root *pere- (2) "to grant, allot").
Weakened sense of "favorably disposed" is from 1580s. Meaning "affecting a part only, not universal or general" is by 1640s.
