revolution

noun

• 1a forcible overthrow of a government or social order, in favour of a new system: the country has had a socialist revolution
• (often the Revolution) (in Marxism) the class struggle which is expected to lead to political change and the triumph of communism: when I grew up it was the Marxism that was very strong, it was like the revolution was coming next week
• a dramatic and wide-reaching change in conditions, attitudes, or operation:marketing underwent a revolution

• 2an instance of revolving:one revolution a second
• [mass noun] the movement of an object in a circular or elliptical course around another or about an axis or centre:revolution about the axis of rotation
• a single orbit of one object around another or about an axis or centre: near the solar equator the sun takes about 26 days to complete one revolution