having or using the ability to act or decide according to your own discretion or judgment; "The commission has discretionary power to award extra funds"
(especially of funds) not earmarked; available for use as needed; "discretionary funds"; "discretionary income"
marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"