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react

[ree-akt] /riˈækt/
verb (used without object)
1.
to act in response to an agent or influence:
How did the audience react to the speech?
2.
to act reciprocally upon each other, as two things.
3.
to act in a reverse direction or manner, especially so as to return to a prior condition.
4.
to act in opposition, as against some force.
5.
to respond to a stimulus in a particular manner:
reacting to a shock by jumping; to react to the word “coward” with anger.
6.
to undergo a chemical reaction.
Origin of react
1635-1645
1635-45; re- + act, probably modeled on Medieval Latin reagere

re-act

[ree-akt] /riˈækt/
verb (used with object)
1.
to act or perform again.
Origin
1650-60; re- + act
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for react
Contemporary Examples
Historical Examples
  • In case the symptoms do not disappear the patients are in better condition to stand and react from operative intervention.

    Psychotherapy James J. Walsh
  • It went off, and Turnbull's mind spiraled into blankness before he could react.

    Dead Giveaway Gordon Randall Garrett
  • These errors will react upon him in the astral life that follows.

    Elementary Theosophy L. W. Rogers
  • Maria Theresa tried to react against this intellectual apathy.

    Belgium Emile Cammaerts
  • This advanced state of culture in Holland did not fail to react upon the neighboring countries.

    Jewish History S. M. Dubnow
British Dictionary definitions for react

react

/rɪˈækt/
verb
1.
(intransitive; foll by to, upon etc) (of a person or thing) to act in response to another person, a stimulus, etc, or (of two people or things) to act together in a certain way
2.
(intransitive) foll by against. to act in an opposing or contrary manner
3.
(intransitive) (physics) to exert an equal force in the opposite direction to an acting force
4.
(chem) to undergo or cause to undergo a chemical reaction
Word Origin
C17: from Late Latin reagere, from re- + Latin agere to drive, do

re-act

/riːˈækt/
verb
1.
(transitive) to act or perform again
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for react
v.

1640s, "to exert, as a thing acted upon, an opposite action upon the agent," from re- + act (v.). Chemical sense is from 1944. Related: Reacted; reacting (1610s). For sense development, see reaction. Meaning "perform again" (often re-act) is from 1650s.

Online Etymology Dictionary, © 2010 Douglas Harper
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react in Medicine

react re·act (rē-ākt')
v. re·act·ed, re·act·ing, re·acts

  1. To act in response to a stimulus.

  2. To undergo a chemical reaction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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