Meaning of REACTIVE in English

■ adjective

1》 showing a response to a stimulus.

2》 acting in response to a situation rather than creating or controlling it.

3》 having a tendency to react chemically.

4》 Physiology showing an immune response to a specific antigen.

5》 (of an illness) caused by a reaction to something.

6》 Physics relating to reactance.


reactivity noun

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.