The Collaborative International Dictionary
Discretionarily
Discretionally \Dis*cre"tion*al*ly\, Discretionarily \Dis*cre"tion*a*ri*ly\, adv. At discretion; according to one's discretion or judgment.
Wiktionary
discretionarily
adv. At one's discretion.
Usage examples of "discretionarily".
Whether that authority should be more or less than congress then discretionarily exercised was not the question.