a. [f. prec. vb. + -ABLE.] That may be ascertained.
† 1. Capable of being fixed, settled or decided.
1783. Blair, Rhetoric (1801), I. 29. Ascertainable by no standard, but wholly dependent on changing fancy.
2. Capable of being discovered or learned by experiment, examination or investigation.
1805. W. Saunders, Min. Waters, 155. The water does not actually deposit any other substance in any ascertainable quantity.
1859. Ruskin, Two Paths, App. i. 257. Not a matter of opinion at all, but a matter of ascertainable fact.
1874. Farrar, Christ, I. iii. 30. The exact year is not ascertainable with any certainty from Scripture.