Meaning

noun a drastic and far-reaching change in ways of thinking and behaving

noun the overthrow of a government by those who are governed

noun a single complete turn (axial or orbital)

originInherited from Middle English revolucion, borrowed from Old French revolucion, from Late Latin revolūtiō (“the act of revolving; revolution”), from Latin revolvō (“roll back, revolve”).

Etymology from Wiktionary, CC BY-SA 3.0