Definition of reaction. 1 a : the act or process or an instance of reacting. b : resistance or opposition to a force, influence, or movement especially : tendency toward a former and …

re·ac·tion 1. A rearrangement of the atoms or molecules of two or more substances that come into contact with each other, resulting... 2. A change to the structure of an atomic nucleus; a nuclear reaction. 3. An action that results directly from or …

reaction the action caused by the resistance to another action. a return to the opposite physical condition, as after shock, exhaustion, or chill.

reaction definition: 1. behaviour, a feeling or an action that is a direct result of something else: 2. someone's…. Learn more.

reaction Add to list Share noun an idea evoked by some experience “his reaction to the news was to start planning what to do” see more see... noun a response that reveals a person's feelings or attitude “he was pleased by the audience's reaction to …

1.opposite action or counteraction; the response of a part to stimulation. 2.the phenomena caused by the action of chemical agents; a chemical process in which one substance is transformed into another substance or substances. 3.in psychology, the mental or emotional state that develops in any particular situation.

re·ac·tion. (rē-ăk′shən) 1. A rearrangement of the atoms or molecules of two or more substances that come into contact with each other, resulting in the formation of one or more new substances. Chemical reactions are caused by electrons of one substance interacting with those of another.

Definition of chemical reaction. : a chemical change that occurs when two or more substances combine to form a new substance.

Basic Concepts of Chemical Reactions A Chemical Reaction is a process that occurs when two or more molecules interact to form a new product (s). Compounds that interact to produce new compounds are called reactants whereas the newly formed compounds are called... Chemical reactions play an integral ...

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.