(transitive) To find out definitely; to discover or establish.
As soon as we ascertain what the situation is, we can plan how to proceed.
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(transitive, obsolete) To make (someone) certain or confident about something; to inform.
Walk the dog in the pounding rain / Looking for a way out of my brain, trapped in it / But I cannot ascertain that I'm trapped in it / Or that the traps even real so I remain trapped in this chambers
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(intransitive, Yorkshire, dated) To look for something lost.
Therfore the saide cõmissioners shall mowe say that nowe late during the parlement the King ascertaigned of the saide maliciouse prpose of his enemys, willed and desired the lords being then present to shewe their̃ good willes aide and h…
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