discretional

As adjectives the difference between arbitrary and discretional

is that arbitrary is (usually|of a decision) based on individual discretion or judgment; not based on any objective distinction, perhaps even made at random while discretional is discretionary.

As a noun arbitrary

is anything arbitrary, such as an arithmetical value or a fee.

As adjectives the difference between optional and discretional

is that optional is not compulsory; left to personal choice; elective while discretional is discretionary.

As a noun terms

is .

As an adjective discretional is

discretionary.

As adjectives the difference between discretional and discretionary

is that discretional is discretionary while discretionary is available at one's discretion; able to be used as one chooses; left to or regulated by one's own discretion or judgment.