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Definition & Meaning of "reactive"in English

reactive
01

acting in response to a situation rather than initiating or controlling it 

Grammatical Information
Composition
Compound
qualitative
Superlative
most reactive
Comparative
more reactive
gradable
domain
behavior, response, strategy
Examples
The company remained reactive instead of taking a proactive approach. 
02

responding to a stimulus, signal, or influence rather than acting independently 

Examples
Pupils are reactive to light, contracting and dilating as needed. 
03

having a tendency to undergo chemical reactions 

Examples
Sodium is highly reactive with water. 
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