quadrant, a quarter of a circle or circular body

revolutionist

change, alteration, turn

agricultural revolution

declaration, proclamation of revolution

section of a circle

(Geometry) segment of a circle

poet of revolution, revolutionary poet, a poet who instigates revolution through his poetry

flag of revolution

start of winter in the northern hemisphere

great revolution

industrial revolution

arranged in circles, circularly, roundwise, in a circular form, direction or arrangement, circular

revolution of time

Circumcentre.

military coup

a land surrounded by water

semi-circle, a half of a circle or of its circumference