Reaction to the 1963 South Vietnamese coup

Reaction may refer to a process or to a response to an action, event, or exposure:

Physics and chemistry

*Chemical reaction
*Nuclear reaction
*Reaction (physics), as defined by Newton's third law
*Chain reaction (disambiguation).

Biology and medicine

*Adverse drug reaction
*Allergy, Allergic reaction
*Reflex, neural reaction
*Hypersensitivity, immune reaction
*Intolerance (disambiguation)
*Light reaction (disambiguation).

Psychology

*Emotional, reaction
*Reactivity (behaviour)
*Proactivity, opposite of reactive behaviour
*Reactive attachment disorder.

Politics and culture

*Reactionary, a political tendency
*Reaction video
*Commentary (disambiguation).

Proper names and titles

*Reaction (album), ''Reaction'' (album), a 1986 album by American R&B singer Rebbie Jackson
**Reaction (song), "Reaction" (song), the title song from the Rebbie Jackson album
*"Reaction", a single by Dead Letter Circus
*ReAction GUI, a GUI toolkit used on AmigaOS
*Reaction.life, a political news and commentary website edited by Iain Martin
*Reaction Records, a record label
*''TNA Reaction'', a former documentary show of TNA Wrestling (now known as Impact Wrestling) behind the scenes
*Reaction (The Spectacular Spider-Man), Reaction (''The Spectacular Spider-Man''), an episode of the American animated television series ''The Spectacular Spider-Man''
*''The Reaction'', a novel in the ''Animorphs'' series
*''Reactions (journal), ''Reactions'' (journal), a chemistry journal published by MDPI

See also

*Action (disambiguation)
*Stimulus (disambiguation)

{{Disambiguation