Definition of reactivity
: the quality or state of being reactive
- emotional reactivity
- chemical reactivity
- If the brain, responding to psychological stress, stimulates the release of cortisol and cortisol suppresses the reactivity of the immune system, then a dormant viral infection may well flare up, or a new one catch hold.
- —Matt Ridley
- Abnormal reactivity to light and abnormal pupillary size may be important clues to the presence of cranial injury in the setting of head trauma.
- — Bradford J. Shingleton
