A partisan is a member of an irregular military force formed to oppose control of an area by a foreign power or by an army of occupation. The term can apply to the field element of resistance movements that opposed Nazi domination in several countries during World War II, or those who after the war fought the Soviet Union's Communist rule in eastern Europe.
in general terms, a strong, often emotional supporter (an individual or group) of a person or cause. In political terms, an election that is essentially a contest between the candidates of rival parties.
partial to a particular party or person, often political in nature. One criticism of federal politics, especially regarding Congress, is that some politicians spend more time and effort trying to promote their party's platform than trying to develop laws and policies which serve the American people.
A partisan (also partizan) is a type of polearm that was used in Europe during medieval times. It consisted of a spear or lance head that was constructed as a small double headed axe built into the lower blade. Time showed this to not be the most effective design for war; however, the partisan stayed in 'use' for many years as a ceremonial weapon after it had become obsolete.