ascertain.
To find out definitely; to discover or establish.
Meaning & usage
To find out definitely; to discover or establish.
As soon as we ascertain what the situation is, we can plan how to proceed.
To make (someone) certain or confident about something; to inform.
To look for something lost.
To establish, to prove.
To ensure or effect.
Where this word comes from
From Middle English acerteynen, from Old French acertener, from a- (“to, towards”) + certener (“make sure of”), from the adjective certain, from Latin certus (“certain, fixed”). Compare to Spanish acertar.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.