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

(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.