1. n. [Geology]

A major episode of plate tectonic activity in which lithospheric plates collide and produce mountain belts, in some cases including the formation of subduction zones and igneous activity. Thrust faults and folds are typical geological structures seen in areas of orogeny.

See related terms: craton,  fault,  fold,  igneous,  lithosphere,  massif,  orogenic,  plate tectonics,  structure,  thrust fault