|1.||readily partaking in chemical reactions: sodium is a reactive metal; free radicals are very reactive|
|2.||of, concerned with, or having a reactance|
|3.||responsive to stimulus|
|4.||(of mental illnesses) precipitated by an external cause: reactive depression|
reactivity re·ac·tiv·i·ty (rē'āk-tĭv'ĭ-tē)
The property of reacting.
The process of reacting.