REACTIVE definition: 1. reacting to events or situations rather than acting first to change or prevent something: 2…. Learn more.

Dec 4, 2016 · The meaning of REACTIVE is of, relating to, or marked by reaction or reactance. How to use reactive in a sentence.

If someone is reactive, they behave in response to what happens to them, rather than deciding in advance how they want to behave. I want our organization to be less reactive and more pro-active.

REACTIVE definition: tending to react. See examples of reactive used in a sentence.

Define reactive. reactive synonyms, reactive pronunciation, reactive translation, English dictionary definition of reactive. adj. 1. Tending to be responsive or to react to a stimulus.

There are 17 meanings listed in OED's entry for the word reactive, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

In chemistry, reactivity is the impulse for which a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy. Reactivity refers to: the …

Aug 29, 2025 · The word "reactive" is an adjective that describes someone or something that responds to a stimulus or event rather than acting proactively. Think of it as the difference between waiting for …

REACTIVE meaning: 1 : done in response to a problem or situation reacting to problems when they occur instead of doing something to prevent them; 2 : tending to change into something else when …

Dec 4, 2025 · reactive (comparative more reactive, superlative most reactive) That reacts or responds to a stimulus. (chemistry) That readily takes part in reactions.