Definition of reactive in English:


Syllabification: re·ac·tive
Pronunciation: /rēˈaktiv


  • 1Showing a response to a stimulus: pupils are reactive to light
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    • Is the measles virus reactive to ultra violet light?
    • The reactive response is when my ego is offended.
    • I was a bit surprised to read the reactive / defensive response of some of my classmates.
  • 1.1Acting in response to a situation rather than creating or controlling it: a proactive rather than a reactive approach
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    • The leaders who built enduring great companies showed a creative inside-out approach rather than a reactive outside-in approach.
    • The key is to be proactive rather than reactive taking a firm stance before the situation gets out of hand.
    • Much of Cuba's Internet control strategy has entailed reactive state responses to the challenges outlined above.
  • 1.2Having a tendency to react chemically: nitrogen dioxide is a highly reactive gas
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    • Ozone is produced when sunlight triggers chemical reactions involving reactive hydrocarbons and nitrogen oxides.
    • A molecule's functional group is the chemically reactive portion, or segment, of an organic chemical molecule.
    • At room temperature, formaldehyde is an extremely reactive colorless gas with a suffocating odor.
  • 1.3 Physiology Showing an immune response to a specific antigen.
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    • Several methods are available to prevent the formation of preformed reactive antibodies to HLA antigens.
    • Arrows indicate cells reactive to the zeatine specific antibodies.
    • Eyebright appears to make your immune system less reactive to airborne allergens.
  • 1.4(Of a disease or illness) caused by a reaction to something: reactive arthritis reactive depression
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    • Reiter's syndrome is a form of reactive arthritis, an inflammation of the joints that occurs in response to infection.
    • The histologic causes of these false-positive lymph nodes were granuloma, reactive inflammation, and anthracosis.
    • The etiology of a pulmonary exacerbation is likely a variety of airway insults including respiratory viral infections, reactive airway disease, and pollutants.
  • 1.5 Physics Of or relating to reactance: a reactive load
    More example sentences
    • It is important to remember that any reactive load will produce standing waves on the line.
    • There are separate accumulators for generator tripping and 500-kV reactive power compensation switching for this algorithm as well.
    • Generator tripping must be technically and contractually feasible, and the reactive power devices must be in place.

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