Dictionary entries for 'reaction'

Synonyms

re·ac·tion (rē-ăḱshən)

noun

1. A response to a stimulus.
2. The state resulting from such a response.
A reverse or opposing action.
1. A tendency to revert to a former state.
2. Opposition to progress or liberalism; extreme conservatism.
Chemistry A change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances.
Physics A nuclear reaction.
Physics An equal and opposite force exerted by a body against a force acting upon it.
The response of cells or tissues to an antigen, as in a test for immunization.