Proper noun
(history, European history) sometimes mixed up or confused with Age of Revolution in Europe from 1789 or 1815/30 (Pre-March era pre-March era) to 1848. (depending on region)
(history, European history) A period from 1848-49 (Revolutions of 1848) characterised by political upheavals throughout Europe which aimed to replace monarchies with independent nation-states.
(history) A general term for similar revolutions in recent times; cf. Arab Spring
Source: en.wiktionary.org