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. See examples of reaction used in a sentence.

A chemical reaction is the change that happens when two or more substances are mixed with each other.

Nov 30, 2025 · What are the basics of chemical reactions? A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, …

Your reaction to something that has happened or something that you have experienced is what you feel, say, or do because of it.

Usage: Reaction is used to refer both to an instant response (her reaction was one of amazement) and to a considered response in the form of a statement (the Minister gave his reaction to the court's …

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

REACTION meaning: 1 : the way someone acts or feels in response to something that happens, is said, etc.; 2 : an action or attitude that shows disagreement with or disapproval of someone or something …

reaction noun (CHANGE) a change in the way people behave or think because they do not agree with the way people behaved or thought in the past:

Synonyms for REACTION: response, answer, take, reply, backlash, reflex, revulsion, recoil; Antonyms of REACTION: action, effect, behavior, cause