What is Active?

Legal Definition
That is in action; that demands action ; actually subsisting ; the opposite of passive. An active debt is one which draws interest. An active trust is a confidence connected with a duty. An active use is a present legal estate.
-- Black's Law Dictionary
Legal Definition
The opposite, of passive. We say active debts, or debts due to us; passive debts are those we owe.
-- Bouviers Law Dictionary