reaction

/ɹiˈækʃən/

reaction noun: an action or statement in response to a stimulus or other event.

Noun

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?
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.
Reactionary politics; a period in which reactionary thought or politics is resurgent or dominant.
- And as Europe advanced year by year more deeply into the low featureless plains of reaction, censorship and mediocrity and the pestilential swamps of poverty, unhappiness and oppression, the image of the liberating revolution became ever more luminous.1962, Eric Hobsbawm, The Age of Revolution. 1789-1848, page 268
(Austrian) Unpurposeful behavior.
(Internet) An icon or emoji appended to a posted message by a user to express their feeling about it.

reaction meaning in Hindi, Tamil, Marathi and Urdu

reaction in Hindi

action in response to an event: प्रतिक्रिया pratikriyā, प्रक्रिया prakriyā
chemical transformation: रासायनिक अभिक्रिया rāsāynik abhikriyā

reaction in Tamil

விளைவு, எதிர்வினை, சலனம், வேதிவினை, தாக்கம்

reaction in Marathi

action in response to an event: प्रतिक्रिया pratikriyā
chemical transformation: अभिक्रिया abhikriyā

reaction in Urdu

ردعمل, رجعت

More languagesFewer languages

reaction in Bengali: প্রতিক্রিয়া protikriẏa
reaction in Telugu: ప్రతిచర్య praticarya, ప్రతిక్రియ pratikriya, చర్య carya
reaction in Malayalam: പ്രതിപ്രവർത്തനം pratipravaṟttanaṁ
reaction in Kannada: ಪ್ರತಿಕ್ರಿಯೆ pratikriye
reaction in Punjabi: ਪ੍ਰਤੀਕ੍ਰਿਆ, ਪ੍ਰਤੀਕਰਮ, ਪ੍ਰਤੀਕਿਰਿਆ
reaction in Gujarati: પ્રતિક્રિયા
reaction in Odia: ପ୍ରତିକ୍ରିଯ଼ା, ପ୍ରତିକ୍ରିଯ଼ାଃ
reaction in Sanskrit: प्रतिक्रिया pratikriyā, प्रक्रिया prakriyā
reaction in Nepali: प्रतिक्रिया
reaction in Tagalog: reaksyon, balibilos
reaction in Arabic: رَدّ فِعْل radd fiʕl, تَفَاعُل tafāʕul
reaction in Malay: reaksi, tindak balas
reaction in Indonesian: reaksi
reaction in Persian: واکنش vâkoneš, رآکسیون re-âksyon
reaction in Thai: ปฏิกิริยา bpà-dtì-gì-rí-yaa
reaction in Vietnamese: phản ứng

Examples of reaction in a sentence

Skill is the product of hours of practice. His reaction was the product of hunger and fatigue.
Our reaction to cute attributes is understood as the way nature ensures mammals care for their young.
The heat of the sunlight affected the speed of the chemical reaction.

All 40 example sentences with reaction

Synonyms of reaction

reax
rxn

Forms of reaction

plural	reactions
alternative form (rare)	reäction

Plural of reaction: reactions

Origin of reaction

Inherited from Middle English reaccion, from Old French reaction, from Latin reāctiō, from the verb reagō, from re- (“again”) + agō (“to act”); more at re-, action; equivalent to react + -ion.

Words formed from reaction

Phrases with reaction

84 more phrasesFewer phrases

Words that rhyme with reaction

20 more rhymesFewer rhymes

Questions about reaction

What does reaction mean?: Reaction means an action or statement in response to a stimulus or other event.
What is reaction in Hindi?: Reaction in Hindi is प्रतिक्रिया (pratikriyā), प्रक्रिया (prakriyā), रासायनिक अभिक्रिया (rāsāynik abhikriyā). See Reaction meaning in Hindi.
What part of speech is reaction?: Reaction is a noun.
How do you pronounce reaction?: Reaction is pronounced /ɹiˈækʃən/.
What is the plural of reaction?: The plural of reaction is reactions.

Words near reaction in the dictionary

Adapted from Wiktionary: reaction (page history and authors); reaction (Tamil Wiktionary) (page history and authors); reaction (Urdu Wiktionary) (page history and authors); പ്രതിപ്രവർത്തനം (Malayalam) (page history and authors); ಪ್ರತಿಕ್ರಿಯೆ (Kannada) (page history and authors); reaction (Punjabi, IndicTrans2 machine translation) (model and license); reaction (Gujarati, IndicTrans2 machine translation) (model and license); reaction (Odia, IndicTrans2 machine translation) (model and license); reaction (Nepali, IndicTrans2 machine translation) (model and license). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Pronunciation audio from Wikimedia Commons, each file under its own free license: en-us-reaction.ogg.

Cite this entry: “reaction.” Word.ws, https://word.ws/reaction. Based on Wiktionary, CC BY-SA 4.0.