Also called February Revolution. the uprising in Russia in March, 1917 (February Old Style), in which the Czarist government collapsed and a provisional government was established.
2.
Also called October Revolution. the overthrow of this provisional government by a coup d'état on November 7, 1917 (October 25 Old Style), establishing the Soviet government.
British Dictionary definitions for Russian Revolution
Russian Revolution
noun
1.
Also called (reckoned by the Julian calendar) February Revolution. the uprising in Russia in March 1917, during which the tsar abdicated and a provisional government was set up
2.
Also called (reckoned by the Julian calendar) October Revolution. the seizure of power by the Bolsheviks under Lenin in November 1917, transforming the uprising into a socialist revolution. This was followed by a period of civil war against counter-revolutionary armies (1918–22), which ended in eventual victory for the Bolsheviks