Definitions
1.nounAn adherent to a party or faction.
2.nounA fervent, sometimes militant, supporter or proponent of a party, cause, faction, person, or idea.
3.nounA member of a band of detached light, irregular troops acting behind occupying enemy lines in the ways of harassment or sabotage; a guerrilla fighter.
4.nounThe commander of a body of detached light troops engaged in making forays and harassing an enemy.
5.adjectiveServing as commander or member of a body of detached light troops."partisan officer, partisan corps"
6.adjectiveAdherent to a party or faction; especially, having the character of blind, passionate, or unreasonable adherence to a party."They were blinded by partisan zeal."
7.adjectiveDevoted to or biased in support of a party, group, or cause."partisan politics"