English
reactivity
From reactive + -ity.
A compound of reactive + -ity
Today it means
noun responsiveness to stimulation
Sources
Sources: Wiktionary, “reactivity”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / reactivity