from
The Collaborative International Dictionary of English v.0.48
Partisan \Par"ti*san\ (p[aum]r"t[i^]*zan), n. [F., fr. It.
partigiano. See {Party}, and cf. {Partisan} a truncheon.]
[Written also {partizan}.]
1. An adherent to a party or faction; esp., one who is
strongly and passionately devoted to a party or an
interest. "The violence of a partisan." --Macaulay.
[1913 Webster]
Both sides had their partisans in the colony.
--Jefferson.
[1913 Webster]
2. (Mil.)
(a) The commander of a body of detached light troops
engaged in making forays and harassing an enemy.
(b) Any member of such a corps.
[1913 Webster]