The Collaborative International Dictionary of English v.0.48:
Ascertainable \As`cer*tain"a*ble\, a. That may be ascertained. -- As`cer*tain"a*ble*ness, n. -- As`cer*tain"a*bly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
ascertainable adj 1: capable of being ascertained or found out; "ascertainable facts" [syn: ascertainable, discoverable]