adj. Available at one's discretion; able to be used as one chooses; left to or regulated by one's own discretion or judgment.
The Century Dictionary and Cyclopedia
Left to discretion; limited or restrained only by discretion or judgment: as, an ambassador invested with discretionary powers (that is, empowered to act according to circumstances).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having or using the ability to act or decide according to your own discretion or judgment
adj. (especially of funds) not earmarked; available for use as needed
Word Usage
"This deals with what we call discretionary spending."