par·ti·san Pronunciation Key (pärt-zn) n. A fervent, sometimes militant supporter or proponent of a party, cause, faction, person, or idea. A member of an organized body of fighters who attack or harass an enemy, especially within occupied territory; a guerrilla. adj. Of, relating to, or characteristic of a partisan or partisans. Devoted to or biased in support of a party, group, or cause: partisan politics. So, now fess up! Who among us thinks that they are not now or ever partisan in any way? Can any of us at any time claim a lack of partisanship especially over political issues? Is it hypocrytical of any of us to call anyone else "partisan" as if it is a characteristic that makes others less credible than ourselves?