arbī̆trārĭus, a, um, adj. [arbiter].
I 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,
II Transf.
A 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.: arbī̆trārĭō : 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).—
B Depending on the will , arbitrary (cf. precarius): motus in arteriā naturalis, non arbitrarius, Gell. 18, 10 fin.