a. [f. prec. vb. + -ABLE.] That may be ascertained.

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  † 1.  Capable of being fixed, settled or decided.

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1783.  Blair, Rhetoric (1801), I. 29. Ascertainable by no standard, but wholly dependent on changing fancy.

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  2.  Capable of being discovered or learned by experiment, examination or investigation.

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1805.  W. Saunders, Min. Waters, 155. The water … does not actually deposit any other substance in any ascertainable quantity.

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1859.  Ruskin, Two Paths, App. i. 257. Not a matter of opinion at all, but a matter of ascertainable fact.

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1874.  Farrar, Christ, I. iii. 30. The exact year … is not ascertainable with any certainty from Scripture.

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