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reaction

noun

re·​ac·​tion rē-ˈak-shən How to pronounce reaction (audio)
1
a
: the act or process or an instance of reacting
b
: resistance or opposition to a force, influence, or movement
especially : tendency toward a former and usually outmoded political or social order or policy
2
: a response to some treatment, situation, or stimulus
her stunned reaction to the news
also : such a response expressed verbally
critical reaction to the play
3
: bodily response to or activity aroused by a stimulus:
a
: an action induced by vital resistance to another action
especially : the response of tissues to a foreign substance (such as an antigen or infectious agent)
b
: depression or exhaustion due to excessive exertion or stimulation
c
: heightened activity and overaction succeeding depression or shock
d
: a mental or emotional disorder forming an individual's response to his or her life situation
4
: the force that a body subjected to the action of a force from another body exerts in the opposite direction
5
a(1)
: chemical transformation or change : the interaction of chemical entities
(2)
: the state resulting from such a reaction
b
: a process involving change in atomic nuclei

Example Sentences

Their reaction to the news was positive. When I told him what happened, his immediate reaction was one of shock. The announcement produced an angry reaction from most of the people at the meeting. My first reaction when I met him was not to trust him. There hasn't yet been much reaction to the announcement. There has been strong reaction against the government's policies. A good driver has quick reactions. The speed of his reactions saved his life. See More
Recent Examples on the Web My hope is that people will take the time to stand still and think here, to fully experience these elements together and have an emotional reaction that stays with them long after their visit. Norman Vanamee, Town & Country, 7 Sep. 2022 Yet in September, 2022, millions of people saw an image and had the exact same reaction, and rallied together to achieve a common cause. Will Sloan, The New Yorker, 6 Sep. 2022 Parents have argued the bill would interfere with their rights to choose what is best for their child and could lead to treatment complications if a child had a serious reaction and hadn't disclosed that they were vaccinated. Anahi Valenzuela, The Week, 31 Aug. 2022 That's why some people may only have a mild reaction to bites, while others, more sensitive to the foreign protein, react with large areas of swelling that are more painful. Melissa Mahtani, CNN, 31 Aug. 2022 Generally, this happens when someone with a seasonal allergy has a reaction in their mouth and throat to a fruit or vegetable that contains a similar protein. Emilia Benton, Men's Health, 29 Aug. 2022 Key Arizona Republicans had no immediate reaction to Hamadeh's teenage posts, although many are listing election security among their top issues and advocating for legislation that will tighten voting laws in future elections. Tara Kavaler, The Arizona Republic, 25 Aug. 2022 Neither Fox nor Croft had any discernible reaction as U.S. District Judge Robert Jonker read the verdicts, both staring forward and occasionally leaning over to speak to their attorneys. Tresa Baldas, Detroit Free Press, 23 Aug. 2022 Neither Fox nor Croft had any discernible reaction as U.S. District Judge Robert Jonker read the verdicts, both staring forward and occasionally leaning over to speak to their attorneys. Tresa Baldas, USA TODAY, 23 Aug. 2022 See More

Word History

First Known Use

1585, in the meaning defined at sense 1a

Time Traveler
The first known use of reaction was in 1585

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