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partisan (n.)

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) "a part, piece, a share, a division; a party or faction; a part of the body; a fraction; a function, office" (from PIE root *pere-(2) "to grant, allot"). Sense of "guerrilla fighter" is first recorded 1690s.

partisan (adj.)

1708 for warfare, 1842 for politics, from partisan (n.).

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