(politics) Favoring a return to an alleged golden age of the past; anti-progressive. / (chemistry) Of, pertaining to, participating in or inducing a chemical reaction. / In reaction to, as a result of.

(politics) One who is opposed to change and wants to reverse it, wishing for a return to an alleged golden age of the past.

plural of reactionary

Quality of being reactionary.

(politics, chiefly derogatory) Reacting against the (especially liberal) values of the modern world; now typically seen as characterised by opposition to egalitarianism, support for strong centralised government, and espousal of conservative economic policies.

(politics, chiefly derogatory) Someone who holds such views.

plural of neo-reactionary

(politics) The advocacy of reactionary political positions.