I think Greg's definition is right on target. A few other examples on Bonapartism beyond Napoleon I & III are:
- - Charles De Gaulle during the retreat from Algeria, 1962. - - Indira Gandhi during the "Emergency" period: 1975-1977.
I believe that Bonapartism is also known as Caesar-ism after Gaius Julius Caesar.
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CB: I.e. it is a dictatorship taking over from a form that is republican relative to it.