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Webster 1913 Edition

Adj.

That may be ascertained.

–

Asˊcer-tain′a-ble-ness

Noun.

–

Asˊcer-tain′a-bly

adv.

Adj.

That may be made certain in fact, or certain to the mind; that may be certainly known or reduced to a certainty.

ascertainable ‎(comparative more ascertainable, superlative most ascertainable)

able to be ascertained