reactive.
That reacts or responds to a stimulus.
Meaning & usage
That reacts or responds to a stimulus.
That readily takes part in reactions.
francium is the most reactive of the alkali metals.
Characterized by induction or capacitance rather than resistance.
Reacting to the past rather than anticipating the future, not predictive.
Where this word comes from
Etymology tree English react Proto-Indo-European *-wós Proto-Indo-European *-iHwósder. Latin -īvus Old French -ifbor. Middle English -yf English -ive English reactive From react + -ive.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.