discretionary

discretionary /dɪˈskrɛʃəˌneri/ Brit /dɪˈskrɛʃənri/ adjective
discretionary
/dɪˈskrɛʃəˌneri/ Brit /dɪˈskrɛʃənri/
adjective
Britannica Dictionary definition of DISCRETIONARY
1 
: available to be used when and how you decide
2 
: done or used when necessary