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

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.

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

A period in which attitudes towards sexual behavior undergo a substantial change, usually in the direction of increased liberality.

Any non-violent political revolution, especially the events in Czechoslovakia that led to the velvet divorce.

A solid produced by taking a particular two-dimensional curve and rotating it through 360° about an axis. The curve will sweep out a surface, and the region inside the surface defines a solid.

(historical) The major technological, socioeconomic and cultural change in the late 18th and early 19th century resulting from the replacement of an economy based on manual labour to one dominated by industry and machine manufacture.

Any of several revolutionary changes that have occurred in the agricultural practices of societies throughout history.

(mathematics) A surface formed when a given curve is revolved around a given axis. If the resulting surface is a closed one, it also defines a solid of revolution.

(archaeology) the discovery of agriculture