discretionary

英 [dɪ'skreʃ(ə)n(ə)rɪ] 美[dɪ'skrɛʃə'nɛri]

• adj. 任意的；自由决定的

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"

2. (especially of funds) not earmarked; available for use as needed;

"discretionary funds"

"discretionary income"