IELTS Anvil

ascertain

CEFR: C1

To discover, establish, or verify factual information with definitive mathematical or empirical certainty through investigation.

Synonyms

determine
verify
discern

Common Collocations

ascertain the truth
ascertain the cause
hard to ascertain

Example Sentence

Clinical trial researchers conducted double-blind trials to ascertain the optimal pharmaceutical dosage for hypertensive patients.

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