What is the meaning of Reactive?

That reacts or responds to a stimulus.

That readily takes part in reactions.

Characterized by induction or capacitance rather than resistance.

Reacting to the past rather than anticipating the future, not predictive.

inflection of reactivar:

  1. first/third-person singular present subjunctive
  2. third-person singular imperative

first/third-person singular present subjunctive

third-person singular imperative

Source: wiktionary.org