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Adjective: discretionary  di'skre-shu,ne-ree [N. Amer], di'skre-shu-n(u-)ree [Brit]
  1. 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";
    - discretional
  2. (especially of funds) not earmarked; available for use as needed
    "discretionary funds"; "discretionary income"

See also: arbitrary, unrestricted