reaction

See also: réaction and reäction

English

Old French reaction, from Latin reactio, from the verb reago, from re- (“again”) + ago (“to act”); more at English re-, action; equivalent to react +‎ -ion

reaction (plural reactions)

An action or statement in response to a stimulus or other event
The announcement of the verdict brought a violent reaction.

You were in the courtroom. What is your reaction?

When I last tried to eat strawberries I had a terrible allergic reaction.
(chemistry) A transformation in which one or more substances is converted into another by combination or decomposition
In this reaction, the acid and base will neutralize each other, producing a salt.
(politics) Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.

action in response to an event

Afrikaans: reaksie
Albanian: reagim (sq)
Arabic: رَد فِعْل‎ m (rad fiʿl)
Armenian: ռեակցիա (hy) (ṙeakcʿia)
Belarusian: рэакцыя f (reákcyja)
Bulgarian: реакция (bg) f (reákcija)
Catalan: reacció (ca) f
Chinese:
Mandarin: 反應 (zh), 反应 (zh) (fǎnyìng), (political) 反動 (zh), 反动 (zh) (fǎndòng)
Czech: reakce (cs) f
Danish: reaktion (da) c
Dutch: reactie (nl) f
Esperanto: reakcio, reago
Finnish: reaktio (fi), vastavaikutus (fi)
French: réaction (fr) f
Galician: reacción (gl) f
German: Reaktion (de) f
Greek: αντίδραση (el) f (antídrasi)
Hindi: प्रतिक्रया (pratikrayā)
Hungarian: reakció (hu)
Indonesian: reaksi (id)
Irish: frithghníomhaíocht f
Italian: reazione (it) f

Japanese: 反応 (ja) (はんのう, hannō), (political) 反動 (ja) (はんどう, handō)
Korean: 반응 (ko) (baneung) (反應 (ko)), (political) 반동 (ko) (bandong) (反動 (ko))
Luxembourgish: Reaktioun f
Macedonian: реакција f (reakcija)
Malay: reaksi, tindak balas
Norwegian:
Bokmål: reaksjon (no) m

Nynorsk: reaksjon m
Persian: واکنش‎ (fa) (vâkoneš), رآکسیون‎ (reâksyon)
Polish: reakcja (pl) f
Portuguese: reação (pt) f
Punjabi: ਰੇਅਕ੍ਤਿਓਨ f (reaktion)
Romanian: reacția f, reacție (ro) m
Russian: реа́кция (ru) f (reákcija)
Spanish: reacción (es) f
Swahili: mmenyuko
Swedish: reaktion (sv) c
Telugu: ప్రతిచర్య (praticharya), ప్రతిక్రియ (pratikriya); చర్య (charya) (in chemical reaction)
Thai: ปฏิกิริยา (th) (bpà-dtì-gì-rí-yaa)
Turkish: tepki (tr), reaksiyon (tr)
Ukrainian: реакція f (reákcija)
Vietnamese: phản ứng (vi) (反應)

chemical transformation

reaction (plural reactiones)

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