There is considerable confusion about whether ensure and insure are distinct words, variants of the same word, or some combination of the two. They are in fact different words, but with sufficient overlap in meaning and form as to create uncertainty as to which should be used when. We define ensure as “to make sure, certain, or safe” and one sense of insure, “to make certain especially by taking necessary measures and precautions,” is quite similar. But insure has the additional meaning “to provide or obtain insurance on or for,” which is not shared by ensure. Some usage guides recommend using insure in financial contexts (as in “she insured her book collection for a million dollars”) and ensure in the general sense “to make certain” (as in “she ensured that the book collection was packed well”).
ensure, insure, and assure are interchangeable in many contexts where they indicate the making certain or inevitable of an outcome, but ensure may imply a virtual guarantee
the government has ensured the safety of the refugees
, while insure sometimes stresses the taking of necessary measures beforehand
careful planning should insure the success of the party
, and assure distinctively implies the removal of doubt and suspense from a person's mind.
I assure you that no harm will be done
secure implies action taken to guard against attack or loss.
sent reinforcements to secure their position
Examples of ensure in a Sentence
A combination of … personal courage, dashing leadership from the front, willingness to share the toughest rigours suffered by the ordinary soldiers, and a liberal dose of sheer good fortune ensured his stature as a great general.—Paul Cartledge, History Today, July 2004Indeed, even though she's been off the mainstream radar for more than a decade, her passionate love for and commitment to rock & roll have ensured that she's managed to make a steady living.—Tom Sinclair, Entertainment Weekly, 24 Nov. 2000At 20, [Kobe] Bryant is already living the modern American dream, a $70 million man on the NBA's glamour team in the nation's starriest city. His acrobatic moves make him the envy of teenage boys and his good looks and megawatt smile a heartthrob for teenage girls, ensuring his status as one of the NBA's premier pitchmen …—Allison Samuels et al., Newsweek, 31 May 1999
They took steps to ensure the safety of the passengers.
regulations that ensure the wholesomeness of our food
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Made with a titanium barrel, these curling irons heat the hair from within, ensuring minimal damage while providing a long-lasting hold.—Kiana Murden, Vogue, 1 July 2025 Both vessel types are great options, but taking your personal travel style, priorities, and pace into account will ensure a dream vacation to remember.—Jill Schildhouse, Forbes.com, 1 July 2025 Loro Piana’s Wish Onde Soft also boasts exceptional softness and hairiness, while the new Wish Rice part of the same family is a fancy yarn defined by a rugged, tactile effect ensured by chain-like structure.—Martino Carrera, Footwear News, 1 July 2025 Suffocate them with an ample deluge of water and stir to ensure complete cooling.—Ca Weather Bot, Sacbee.com, 1 July 2025 See All Example Sentences for ensure
Word History
Etymology
Middle English, from Anglo-French ensurer, alteration of assurer — more at assure
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