Definition from Wiktionary, the free dictionary
- A recognized political party or group of parties in multiparty political systems that is present in Parliament or some other legislative body and does not control the floor (usually due to being in the minority).
- An unrecognized political party in a one-party state.
- Actions by one political group against another political group, either by using governmental power or by popular actions such as protests.
- A more general case of disagreement in politics.