REACTION definition: a reverse movement or tendency; an action in a reverse direction or manner. See examples of reaction used in a sentence.

Reacting to an email in Outlook When you receive an email, and you want to send a reaction: Select the reactions button near the top of the message window and you'll see a gallery of …

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

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.

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 …

When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.

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 definition: A reverse or opposing action.

Dec 28, 2025 · Noun reaction (plural reactions) An action or statement in response to a stimulus or other event.

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