reaction

noun

1. (chemistry) a process in which one or more substances are changed into others

   noun.process

   Examples

   There was a chemical reaction of the lime with the ground water.

   Synonyms chemical reaction

   Source: WordNet 3.0

2. an idea evoked by some experience

   noun.cognition

   Examples

   His reaction to the news was to start planning what to do.

   Source: WordNet 3.0

3. a bodily process occurring due to the effect of some antecedent stimulus or agent

   noun.act

   Examples

   A bad reaction to the medicine.

   Synonyms response

   Source: WordNet 3.0

4. (mechanics) the equal and opposite force that is produced when any force is applied to a body

   noun.phenomenon

   Examples

   Every action has an equal and opposite reaction.

   Source: WordNet 3.0

5. a response that reveals a person's feelings or attitude

   noun.phenomenon

   Examples

   He was pleased by the audience's reaction to his performance.

   John feared his mother's reaction when she saw the broken lamp.

   Source: WordNet 3.0

6. extreme conservatism in political or social matters

   noun.cognition

   Examples

   The forces of reaction carried the election.

   Source: WordNet 3.0

7. doing something in opposition to another way of doing it that you don't like

   noun.act

   Examples

   His style of painting was a reaction against cubism.

   Source: WordNet 3.0

8. Any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action.

   noun

   Source: webster1913

9. A regular or characteristic response to a stimulation of the nerves.

   noun

   Source: webster1913