Definition of "discretionary"

discretionary

/dɪˈskɹɛʃən(ə)ɹi/

adjective
comparative more discretionary, superlative most discretionary
1. Available at one's discretion; able to be used as one chooses; left to or regulated by one's own discretion or judgment.
  Quotations
  The new normal: Will demand quickly return to pre-COVID levels?Unlikely, if only because with the country (and the world) in deep recession, many younger people will be in serious financial difficulty. A lack of disposable income simply won't allow them much discretionary travel.
  2020 May 6, Prof. Andrew McNaughton, “Time to challenge some sacred philosophies of recent years”, in Rail, page 32