1.an overthrow or repudiation and the thorough replacement of an established
government or political system by the peoplegoverned.
2. Sociology . a radical and pervasive change in society and thesocial structure, especially one made suddenly and oftenaccompanied by violence.
3. a sudden, complete or marked change in something: thepresent revolution
in church architecture.
4.a procedure or course, as if in a circuit, back to a startingpoint.
5.a single turn of this kind.