Lewis & Short

possĭbĭlĭtas, ātis, f. [possibilis], ability to do a thing, possibility, power (post-class.), Arn. 1, 25: fandi, Mart. Cap. 4, § 335: pro possibilitate, according to ability or strength, Amm. 19, 2, 15; Vulg. 2 Esdr. 5, 8.