reactivity
Americannoun
-
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.
Other Word Forms
Etymology
Origin of reactivity
Vocabulary lists containing reactivity
Structure and Properties of Matter - Middle School
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Structure and Properties of Matter - Introductory
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Structure and Properties of Matter - High School
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Because we lose the ability to exert force quickly as we get older. Plyometrics — involving motor control, coordination, agility and reactivity — trains quick responses.”
From Los Angeles Times ● Aug. 18, 2026
But for others, the need for the cash is driven more by feelings and reactivity.
From MarketWatch ● May 1, 2026
"Also, prolonged vibration changes the reactivity of the neuromuscular spindles and alters the signal sent to the brain."
From Science Daily ● Jan. 8, 2026
Paris police chief Patrice Faure paid tribute to "the reactivity and the mobilisation" of the investigators that led to the arrest of the suspect.
From Barron's ● Dec. 27, 2025
Too much reactivity and we would spontaneously combust.
From "The Gene" by Siddhartha Mukherjee
Random Word
Spin the wheel and learn a new word!
Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
