- 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 ascertainable
If any name was given to the anterior family it is not now ascertainable.Ancient Society
Lewis Henry Morgan
Precisely when Herrick was invested with holy orders is not ascertainable.Ponkapog Papers
Thomas Bailey Aldrich
Hence, for the post from Quebec to Montreal no legal rate was ascertainable.The Development of Rates of Postage
A. D. Smith
In a majority of cases such reasons are, to a great extent, ascertainable.How to Observe
Hence, its laws should be founded on the highest views of the divine will ascertainable.National Character
N. C. Burt
- to determine or discover definitely
- archaic to make certain
Word Origin and History for ascertainable
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.