Pichincha pēchēn´chä [key], volcano, 15,918 ft (4,852 m) high, N Ecuador, near Quito. It last erupted in 1881. On its lower slopes, in the decisive battle of Pichincha on May 24, 1822, patriot forces under Antonio José de Sucre routed the Spanish royalists and freed the territory that was to become Ecuador.
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