partisanyoudaoicibaDictYouDict[partisan 词源字典]
partisan: [16] Etymologically, a partisan is someone who takes a ‘part’ – in the sense ‘side’ or ‘cause’. The word comes via French partisan from partisano, a dialect form of mainstream Italian partigiano, which was based on parte ‘part’.
=> part[partisan etymology, partisan origin, 英语词源]
partisan (n.)youdaoicibaDictYouDict
also partizan, 1550s, "one who takes part with another, zealous supporter," from Middle French partisan (15c.), from dialectal upper Italian partezan (Tuscan partigiano) "member of a faction, partner," from parte "part, party," from Latin partem (nominative pars), see part (n.). Sense of "guerilla fighter" is first recorded 1690s.
partisan (adj.)youdaoicibaDictYouDict
1708 for warfare, 1842 for politics, from partisan (n.).