Simple past tense and past participle of ascertain.(verb)
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Use "ascertained" in a sentence
"But it has failed to provide any method by which one can have his title ascertained and established as against all the world."
"These videos, which “often appeal to persons with a very specific sexual fetish,” id., at 2, were made in secret, generally without a live audience, and “the faces of the women inflicting the torture in thematerial often were not shown, nor could the location of the place where the cruelty was being inflicted or the date of the activity be ascertained from the depiction.”"
"It is described as being the skull of an animal of the carnivorous order, as is ascertained from the teeth, with a very large cavity for the brain, and a long, protruding bill or jaw, which is broken off before the molares; the lower part is altogether wanting, and so is the top of the skull."