One who innovates; an introducer of novelties or new methods; †a revolutionist.

A revolutionary. Obsolete. rare.

An advocate of or participant in revolution; a revolutionary.

In the French Revolution, a republican of the poorer classes in Paris. Hence gen. an extreme republican or revolutionary.

A person who instigates or supports revolution; a participant in a particular revolution.

gen. A person engaged in effecting a revolution; a revolutionary. Now rare.

Also with capital initial. (A nickname given to) an ultra-liberal in the Spanish revolutionary war of 1820–3; also in extended use. Obsolete.

Politics. Also with capital initial. A person who advocates radical or far-reaching political or social reform; a member of a political party or…

one who favours sansculottism; also attributive.

Chiefly in French contexts: a revolutionary.

A person who holds radically left-wing republican views. Cf. red republic, n.

A revolutionary, anarchist, or communist. Now chiefly historical.

transferred and figurative. A person of subversive or revolutionary views; an out-and-out opponent of the existing social order or accepted codes.

Also with lower-case initial(s). A young person embracing innovation and desiring radical change to the established order. Usually in plural.