re activity

reactivity

[ree-ak-tiv-i-tee]
noun
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.

Origin:
1885–90; reactive + -ity

hyperreactivity, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

reactivity re·ac·tiv·i·ty (rē'āk-tĭv'ĭ-tē)
n.

  1. The property of reacting.

  2. The process of reacting.

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