ascertain
verb (used with object)
to find out definitely; learn with certainty or assurance; determine.
well-ascertained
-
a word derived from
ascertain.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Nevertheless there are some well-ascertained and remarkable facts, which, as we shall immediately see, show that the act of crossing in itself undoubtedly tends to increase or re-establish the fertility of hybrids.
From The Variation of Animals and Plants Under Domestication, Volume II (of 2) by Charles Darwin
The many well-ascertained cases of various male mammals giving milk, show that their rudimentary mammary glands retain this capacity in a latent condition.
From The Variation of Animals and Plants Under Domestication, Volume II (of 2) by Charles Darwin
A school arose which, defying the individualistic rule of English common law underlying the institutions of the United States, pandered to mob-law and theologic prejudice by denying certain well-ascertained facts in human degeneracy.
From Degeneracy Its Causes, Signs and Results by Eugene S. Talbot
Believers in amulets and charms remind us that it is a well-ascertained fact in nature, that for every bane there is an antidote.
From The Mysteries of All Nations Rise and Progress of Superstition, Laws Against and Trials of Witches, Ancient and Modern Delusions Together With Strange Customs, Fables, and Tales by James Grant
At present there is no well-ascertained fact which proves that the same body can go directly to either of the two poles at pleasure.—Dec.
From Experimental Researches in Electricity, Volume 1 by Michael Faraday
