assure.
To make sure and secure; ensure.
Meaning & usage
To make sure and secure; ensure.
To give (someone) confidence in the trustworthiness of (something).
I assure you that the program will work smoothly when we demonstrate it to the client.
He assured of his commitment to her happiness.
To guarantee, promise (to do something).
To reassure.
Where this word comes from
From Old French asseurer (Modern French assurer), from Latin ad- + securus (“secure”). Cognate with Spanish asegurar. Doublet of assecure.
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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.