n. A spear with a triangular, double-edged blade.n. A soldier armed with such a weapon.n. An adherent to a party or faction.n. A fervent, sometimes militant, supporter or proponent of a party, cause, faction, person, or idea.n. A guerilla fighter; a member of detached light troops acting behind enemy lines.n. The commander of a body of detached light troops engaged in making forays and harassing an enemy.adj. Serving as commander or member of a body of detached light troops: as, a partisan officer or corps.adj. Adherent to a party or faction; especially, having the character of blind, passionate, or unreasonable adherence to a party; as, blinded by partisan zeal.adj. Devoted to or biased in support of a party, group, or cause: partisan politics.