A partisan is a committed member of a political party or army. In multi-party systems, the term is used for persons who strongly support their party's policies and are reluctant to compromise with political opponents. A political partisan is not to be confused with a military partisan.

What is partisan in simple terms?

1 : a firm adherent to a party, faction, cause, or person especially : one exhibiting blind, prejudiced, and unreasoning allegiance political partisans who see only one side of the problem.

What is known as partisanship?

Partisanship is the tendency of supporters of political parties to subscribe to or at least support their party's views and policies in contrast to those of other parties. Extreme partisanship is sometimes referred to as partisan warfare (see Political party).