an adherent or supporter of a person, group, party, or cause, esp. a person who shows a biased, emotional allegiance.
a member of a party of light or irregular troops engaged in harassing an enemy, esp. a member of a guerrilla band engaged in fighting or sabotage against an occupying army.
—adj.
of, pertaining to, or characteristic of partisans; partial to a specific party, person, etc.: partisan politics.
of, pertaining to, or carried on by military partisans or guerrillas.