Definition of assure

The word "assure" comes from the Old French word "asseurer," which is derived from the Latin phrase "assurare," meaning "to make sure" or "to guarantee." The Latin phrase is a combination of "ad" (meaning "to" or "toward") and "suriare" (meaning "to watch over" or "to guard"). The Latin phrase "assurare" means to watch over or guard something, ensuring its safety or security. In Middle English, the word "assuren" emerged, meaning "to make sure" or "to guarantee." Over time, the word evolved into "assure," which has come to mean "to make someone certain" or "to give confidence to." Today, the word "assure" is often used in phrases such as "I assure you" or "I am assured," to convey a sense of certainty or guarantee.