Part of speech: noun

Reverse or return action.

Part of speech: noun

The mutual action of chemical agents, or its result.

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Usage examples "reaction":

  1. Then at last, his work finished, would come inevitable reaction. - "A Breath of Prairie and other stories", Will Lillibridge.
  2. Sudden and violent was Wemyss's reaction, let loose by the parlourmaid's story. - "Vera", Elisabeth von Arnim.
  3. And I think of matter and of history in terms of action and reaction. - "Children of the Market Place", Edgar Lee Masters.