reaction

noun

1
doing something in opposition to another way of doing it that you don't like
his style of painting was a reaction against cubism
2
a bodily process occurring due to the effect of some antecedent stimulus or agent
a bad reaction to the medicine
his responses have slowed with age
3
an idea evoked by some experience
his reaction to the news was to start planning what to do
4
extreme conservatism in political or social matters
the forces of reaction carried the election
5
a response that reveals a person's feelings or attitude
he was pleased by the audience's reaction to his performance
John feared his mother's reaction when she saw the broken lamp
6
(mechanics) the equal and opposite force that is produced when any force is applied to a body
every action has an equal and opposite reaction
7
(chemistry) a process in which one or more substances are changed into others
there was a chemical reaction of the lime with the ground water

Also useful for “reaction”:Unscrambler— Rearrange the letters in “reaction”