(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.

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.

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

(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.

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

The set of wide-ranging technological changes to agriculture in the 20th century, particularly in developing countries, which allowed for greater food production capacity.

The appearance of oxygen in the Earth's atmosphere, possibly as the result of the evolution of photosynthesis

The American Revolutionary War (1775–1783) of the contiguous southern 13 colonies of the British Empire on the east coast of the North American mainland

plural of ellipsoid of revolution