The meaning of REACTION is the act or process or an instance of reacting. How to use reaction in a sentence.

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:

A reaction is an action taken in response to something. If you're telling your parents that you want to move out, you'll see by their reaction that they're sad about it.

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 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 …

Dec 14, 2025 · reaction (plural reactions) An action or statement in response to a stimulus or other event.

Reaction definition: A reverse or opposing action.

Dec 1, 2025 · A minimum energy (activation energy,Ea) is required for a collision between molecules to result in a chemical reaction. Plots of potential energy for a system versus the …

6 days ago · Reaction time is the interval between a sensory cue and a person’s physical response. This span of time is a fundamental aspect of human performance, influencing …