The term Russian Revolution principally refers to the Russian Revolution of 1917, which included the February Revolution resulting in the abdication of Czar Nicholas II and the subsequent Bolshevik revolt, the October Revolution, that eventually saw the czar and his family shot by a communist firing squad. The term Russian Revolution can also refer to the Russian Revolution of 1905, which was an unsuccessful series of riots and anti-government violence against the czar.
If used as a time mark, when the year is not indicated in the reference, the term usually refers to the October Revolution of 1917, whereas references to the revolution of 1905 always mention the year and references to the February Revolution always mention the month.
The Third Russian Revolution was the failed anarchist revolution against the Bolsheviks and the White Army from 1918 to 1922, in which the anarchists tried to drive both of these forces from power.
See also Timeline of The Russian Revolution.