orog·e·ny \ȯˈräjənē\noun alsooro·genesis\ˌōrō+\ (pluraloro·geniesalsoorogeneses) Etymology: International Scientific Vocabulary oro- (I) + -geny : the process of mountain making especially by folding of the earth's crust; also: a sequence of mountain-making movements closely associated in time and place — compare diastrophism, epeirogeny