One party is a term that refers to a situation where a single political party holds the majority or total control of a government or legislative body. Synonyms for the term one party include single-party, monolithic, dominant, uni-party, unitary, sole, exclusive, and unipolar. These words have a similar meaning as one party and are used to describe a political system where there is a single party in power. One-party systems are mostly associated with totalitarian or authoritarian regimes, and they have been linked with corruption and lack of civil liberties. Nevertheless, there are instances where one-party systems are used, such as in countries with a weak opposition or a history of political instability.