9 Grammatical Pitfalls


[ree-ak-tiv-i-tee] /ˌri ækˈtɪv ɪ ti/
the quality or condition of being reactive.
Chemistry. the relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound.
Physics. a measure of the deviation from the condition at which a nuclear reactor is critical.
Immunology. the ability of an antigen to combine with an antibody.
Origin of reactivity
1885-90; reactive + -ity
Related forms
hyperreactivity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for reactivity
  • The mutant proteins were then purified to ensure that reactivity and side effects of the vaccine were minimized.
  • And this, in turn, suggests that anxiety results from a learning disorder rather than a reactivity disorder.
  • The second requirement needs to be that the system has a negative reactivity coefficient.
  • Previous research indicates that oxytocin plays a role in regulating stress and fear reactivity.
  • The modern nuclear plant shuts down when it overheats as it is designed with a negative coefficient of reactivity.
  • It would be interesting to explore the boundary between simple chemical reactivity and primary awareness.
  • Yet this reactivity can also make them good sensors.
reactivity in Medicine

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

  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.
Cite This Source

Word of the Day

Difficulty index for reactivity

Some English speakers likely know this word

Word Value for reactivity

Scrabble Words With Friends