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“discretionary” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

discretionary
by circumlocution. A discretionary power, infinita potestas (an unlimited power, Cic.): arbitrium (with a possessive pronoun, or liberum, etc.): To have discretionary power, sui esse arbitrii; *libere posse ad summam rerum consulere (of an officer in war; after Caes., B.C., 3, 51). A lieutenant has no discretionary power, legati sunt partes ad praescriptum agere (Caes., B.C., 3, 51): to give anybody discretionary power in anything, permittere alicui liberum alicujus rei arbitrium; dare alicui facultatem, ut aliquid suo arbitratu faciat or faceret (Cic., 1, De Fin., extr.). You have a discretionary power, tuum est arbitrium (i. e., whether you will do this or that).

Quick answer

What is the Latin word for discretionary?
The usual Latin words for “discretionary” are arbitrium, līber, faciō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.