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.
To guarantee, promise (to do something).
That as a law for euer should endure; / Which to obserue in word of knights they did assure.
From Old French asseurer (Modern French assurer), from Latin ad- + securus (“secure”). Cognate with Spanish asegurar. Doublet of assecure.
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