ascertain
verb (used with object)
to find out definitely; learn with certainty or assurance; determine.
ascertained
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past participleof ascertain.past participle
A verb form used in perfect and passive verb constructions and that can also function as a modifier.
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past tense formof ascertain.past tense
Used to describe completed actions or previous habitual actions.
ascertainverb (used with object)to find out definitely; learn with certainty or assurance; determine.
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.
The researchers also assessed severity of CTE and found a connection between high grade CTE and dementia before death, with the latter ascertained by the players' medical notes and interviews with family members.
From Barron's ● Aug. 25, 2026
A third person whose injuries had yet to be ascertained was in the process of being brought to hospital.
From Barron's ● Aug. 21, 2026
The three women's recorded cause of death is yet to be ascertained, the court was also told.
From BBC ● May 29, 2026
Both Prieur and Mafart had been involved in planning the operation back in Paris—it was Prieur who had first ascertained the ship’s itinerary by calling Lloyd’s of London and posing as a journalist.
From Slate ● Jul. 22, 2025
Bono had, I ascertained, connived to secrete them when we had removed to this house from the town; having no use for them upon his exile, he had left them for me.
From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume I: The Pox Party" by M.T. Anderson
