(politics) Synonym of reactionaryism

An action or statement in response to a stimulus or other event. / (chemistry) A transformation in which one or more substances is converted into another by combination or decomposition.

plural of reaction

Of or pertaining to a reaction (in any sense)

(chemistry) A process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

(physics) A nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms. / (figuratively) A series of events, each one causing or influencing the next.

(chemistry) Either the oxidation or the reduction component of a redox reaction

A process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes; the reaction products may contain a different element or a different isotope of the same element.

(chemistry) The reaction of a Grignard reagent (an organo-magnesium halide) with aldehydes or ketones to form secondary or tertiary alcohols

(idiomatic) An instantaneous reaction made without thought.