1Attachment to or support for the policy or dynasty of the Napoleons.
2The policies or principles of Napoleon I or Napoleon III; specifically the method of government associated with Napoleon I; the assumption of absolute control over subject peoples or countries.
3Conduct or behaviour likened to that of Napoleon I.
Early 19th century; earliest use found in James Mackintosh (1765–1832), political writer and politician. From the names of NapoléonBonaparte and Charles-Louis-NapoléonBonaparte + -ism.