The meaning of REACTION is the act or process or an instance of reacting. How to use reaction in a sentence. REACTION definition: a reverse movement or tendency; an action in a reverse direction or manner.

Understanding the Context

See examples of reaction used in a sentence. REACTION definition: 1. behaviour, a feeling or an action that is a direct result of something else: 2. someone's….

Key Insights

Learn more. Definition of reaction noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Define reaction. reaction synonyms, reaction pronunciation, reaction translation, English dictionary definition of reaction.

Final Thoughts

n. 1. a. A response to a stimulus. b. The state resulting from such a response.

2. A reverse or opposing action. 3. a.