(geometry) A spheroid; a solid of revolution generated by rotating an ellipse about one of its axes.

A period in France of radical social and political upheaval which saw the country change from a monarchy to a republic (1789–1799).

(historical) The Great Proletarian Cultural Revolution of the Communist China. / (historical) The Iran's Cultural Revolution of 1980-1987.

The paradigm shift, from the Ptolemaic model of the heavens based around the Earth to a heliocentric model, proposed by Nicolaus Copernicus and later supported by Galileo and others.

A productivity revolution caused by the large-scale use of robots. / (science fiction) A violent uprising by sapient robots, aimed at overthrowing human government.

(politics) Any of various related revolutionary movements that developed in several societies in the former Soviet Union and the Balkans during the early 2000s, mostly using nonviolent resistance.

(Marxism) The status of a revolutionary class where it continues to push for and achieve its interests despite the political dominance of those with opposing interests.

A revolution in which a democracy is instituted, replacing a previous non-democratic government, or a revolution which is brought about through democratic means, usually without violence.

Alternative form of counterrevolution

Synonym of palace coup