Etymology
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discretionary (adj.)

"left to discretion, restrained only by judgment," 1680s (implied in discretionarily); see discretion + -ary.

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Definitions of discretionary

discretionary (adj.)
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
Synonyms: discretional
discretionary (adj.)
(especially of funds) not earmarked; available for use as needed;
discretionary income
discretionary funds
From wordnet.princeton.edu