Whether it rains, and whether I bring my umbrella, are each severally matters of atomic fact, ascertainable by observation.
In a majority of cases such reasons are, to a great extent, ascertainable.
This, which is of course not ascertainable, is clearly a very different thing.
The fact that another day had begun was only ascertainable by the shining of the star-like mouth of the hole.
Sometimes the neglected fact is one ascertainable, not by the senses, but by reasoning, which has been overlooked.
The instrument must designate an ascertainable person to whom, or to whose order the money is payable.
That is to say, ascertained or ascertainable effects were made the starting-point instead of the goal of research.
It may even be doubted whether his English was of any ascertainable use to him.
The truths of conduct, as far as they are ascertainable, were known long since to the ancient moralists.
Now the recognition of an ascertainable uniformity in human mortality has become part of the general stock of thought.
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.