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.

Other Words From

• hyper·reac·tivi·ty noun

Word History and Origins

Origin of reactivity¹

First recorded in 1885–90; reactive + -ity

Example Sentences

Classical computers have managed the calculation for molecules as large as pentacene, a chain of five hydrocarbon rings with 22 electrons in “pi” covalent bonds, which govern the molecule’s shape and reactivity.

From Science Magazine

"We've transformed the reactivity of iron metal, the cheapest metal commodity," he said.

From Science Daily

The researchers demonstrated this new reactivity by synthesizing decalins, a building block for many pharmaceuticals.

From Science Daily

“In Rouen, national police officers neutralized early this morning an armed individual clearly wanting to set fire to the city’s synagogue. I congratulate them for their reactivity and their courage,” he said.

From Seattle Times

Schizophrenia has similar symptoms, and one hallmark is abnormal reactivity to a continued stimulus.

From Science Daily

Related Words

• awareness
• feeling
• nervousness
• sense
• subtlety
• sympathy