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 Allergic reaction Reflex, neural reaction Hypersensitivity, immune reaction Intolerance (disambiguation) Light reaction (disambiguation)

Psychology

Emotional, reaction Reactivity 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), a 1986 album by American R&B singer Rebbie Jackson "Reaction" (song), the title song from the Rebbie Jackson album "Reaction", a single by Dead Letter Circus Reactions, a 2018 album by The Mods 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), an episode of the American animated television series The Spectacular Spider-Man The Reaction, a novel in the Animorphs series Reactions (journal), a chemistry journal published by MDPI

See also

Action (disambiguation) Stimulus (disambiguation) Thermidorian Reaction