Reaction meaning

rē-ăkshən
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The definition of a reaction is a response.

An example of a reaction is someone stopping their car at a stop sign.

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A return or opposing action, force, influence, etc.
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(physics) An equal and opposite force exerted by a body against a force acting upon it.
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A response, as to a stimulus or influence.
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A movement back to a former or less advanced condition, stage, etc.; esp., such a movement or tendency in economics or politics; extreme conservatism.
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(physics) A nuclear reaction.
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The response of cells or tissues to an antigen, as in a test for immunization.
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A reverse or opposing action.
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(physiol., psychol.) An organic response to a stimulus.
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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. The reaction of an acid with a base, for example, results in the creation of a salt and water. Some, but not all, reactions can be reversed.
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An action that results directly from or counteracts another action, especially the change in a body's motion as a result of a force applied to it. Some reactions counteract forces and are not readily apparent. When an object rests on a surface, such as a table, for example, the downward force it applies to the surface is counteracted by an equal but upwards force, or reaction, applied by the surface.
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A response to a stimulus, such as a reflex.
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The response of cells or tissues to an antigen, as in a test for immunization.
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An action or statement in response to a stimulus or other event.

The announcement of the verdict brought a violent reaction.

You were in the courtroom. What is your reaction?

When I last tried to eat strawberries I had a terrible allergic reaction.

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(chemistry) A transformation in which one or more substances is converted into another by combination or decomposition.

In this reaction, the acid and base will neutralize each other, producing a salt.

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(chemistry) A change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances.
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Origin of reaction

  • Old French reaction, from Latin reactio, from the verb reago, from re- (“again") + ago (“to act"). More at English re-, action.

    From Wiktionary