reactive

Tending to be responsive or to react to a stimulus.

Characterized by reaction.

Tending to participate readily in reactions.

Pertaining to or causing reaction; acting reflexively or reciprocally; resulting from reflex action.

In alternating-current circuits, same as wattless.

A reagent.

Having power to react; tending to reaction; of the nature of reaction.

that reacts or responds to a stimulus

that readily takes part in reactions

Characterized by induction or capacitance rather than resistance.