ascertain
as·cer·tain (ăs'ər-tānʹ)tr.v. as·cer·tained, as·cer·tain·ing, as·cer·tains 1. To discover with certainty, as through examination or experimentation. See Synonyms at discover. 2. Archaic. To make certain, definite, and precise. [Middle English acertainen, to inform, from Old French acertener, ascertain- : a-, to (from Latin ad-. See ad-) + certain, certain; see certain.] as'cer·tainʹa·ble adj.as'cer·tainʹa·ble·ness n.as'cer·tainʹa·bly adv.as'cer·tainʹment n.
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