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See more synonyms for reactivity on Thesaurus.com
  1. the quality or condition of being reactive.
  2. Chemistry. the relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound.
  3. Physics. a measure of the deviation from the condition at which a nuclear reactor is critical.
  4. Immunology. the ability of an antigen to combine with an antibody.
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Origin of reactivity

First recorded in 1885–90; reactive + -ity
Related formshy·per·re·ac·tiv·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for reactivities

nervousness, subtlety, sympathy, sense, feeling, awareness, susceptibility, consciousness, delicacy, sensation, acuteness, receptiveness, sensitiveness, reactivity, sensibility, impressionability, reactiveness

reactivities in Medicine


  1. The property of reacting.
  2. The process of reacting.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.