- to find out definitely; learn with certainty or assurance; determine: to ascertain the facts.
- Archaic. to make certain, clear, or definitely known.
Origin of ascertain
Examples from the Web for unascertained
It is regarded as a binary of long and as yet unascertained period.Pleasures of the telescope
To which of these classes the Loucheux belongs, has hitherto been unascertained.Opuscula
Robert Gordon Latham
Revenge, he had called it, and called it still, for unascertained and undefined injuries.Command
Thus the conditions under which the scryer can scry, are, as yet, unascertained.Cock Lane and Common-Sense
There was no regularly organized militia there; only a few independent companies of doubtful, or unascertained, loyalty.Campfire and Battlefield
- to determine or discover definitely
- archaic to make certain
Word Origin and History for unascertained
early 15c., "to inform, to give assurance," from Anglo-French acerteiner, Old French acertener "to assure, certify" (13c.), from a "to" (see ad-) + certain "certain" (see certain). Modern meaning of "find out for sure by experiment or investigation" is first attested 1794. Related: Ascertained; ascertaining.