partisan

An adherent to a party or faction.

"Strong partisans of neither party, Indiana farmers failed to act as a block […]"

A fervent, sometimes militant, supporter or proponent of a party, cause, faction, person, or idea.

A member of a band of detached light, irregular troops acting behind occupying enemy lines in the ways of harassment or sabotage; a guerrilla fighter.

The commander of a body of detached light troops engaged in making forays and harassing an enemy.

Serving as commander or member of a body of detached light troops.

partisan officer, partisan corps

Adherent to a party or faction; especially, having the character of blind, passionate, or unreasonable adherence to a party.

They were blinded by partisan zeal.

Having put partisan interests to one side, Greenwood set about making teamwork a watchword for her chairmanship, while seeking the broadest possible participation in subsequent inquiries.

Devoted to or biased in support of a party, group, or cause.

partisan politics

England will regard it as a measure of justice for Frank Lampard's disallowed goal against Germany in Bloemfontein at the 2010 World Cup - but it was also an illustration of how they rode their luck for long periods in front of a predictably partisan home crowd.

A long-handled spear with a triangular, double-edged blade having lateral projections, in some forms also used in boar hunting.

I had as lief have a reed that will do me no service as a partisan I could not heave.

Salisbury and his attendants were also now drawing near, with bills and partisans brandished, and bows already bended.

A soldier armed with such a weapon.