When you have petty cash available to you to use, the money you spend is an example of discretionary spending.
- left to or regulated by one's own discretion or judgment: an appointee with discretionary powersalso dis·cre′tional
- administered by a proxy: a discretionary investment account
- Left to or regulated by one's own discretion or judgment.
- Available for use as needed or desired: a discretionary fund.
(comparative more discretionary, superlative most discretionary)