ensure.
To make sure or certain of something (usually some future event or condition).
Meaning & usage
To make sure or certain of something (usually some future event or condition).
I use an alarm clock to ensure that I get up on time.
To make a pledge to (someone); to promise, guarantee (someone of something); to assure.
Where this word comes from
From Middle English ensuren, from Anglo-Norman enseurer, from Old French seur (“sure”). Doublet of insure.
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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.