A / arbī^trārĭus
adjective

arbī^trārĭus

fem. arbī^trāria · neut. arbī^trārium
Of arbitration; arbitrating; done by way of arbitration
Of arbitration, arbitrating, done by way of arbitration: formula, Gai Inst. 4, 163: actio, Dig. 13, 4, 2; cf. Zimmern, Rechtsgesch. 3 B, §§ 67 and 68.—Hence,
by extension
uncertain; not sure
In Plaut. (with ref. to the distinction in law lang. between certus and arbitrarius: judicium est pecuniae certae, arbitrium incertae, Cic. Rosc. Com. 4; cf. Zimmern, Rechtsgesch. 3 B, § 57) = incertus, uncertain, not sure: hoc certum est, non arbitrarium, Plaut. Am. 1, 1, 216.—Adv.: arbī^trārĭō: nunc pol ego perii certo, non arbitrario, there's no mistake about it, Plaut. Poen. 3, 5, 42 (the only adv. of this word in use).—
Depending on the will; arbitrary
Depending on the will, arbitrary (cf. precarius): motus in arteriā naturalis, non arbitrarius, Gell. 18, 10 fin.