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Definition of Assure at Dictionary.com

[ uh-shoo r, uh-shur ]

/ əˈʃʊər, əˈʃɜr /

verb (used with object), as·sured, as·sur·ing.

to declare earnestly to; inform or tell positively; state with confidence to: She assured us that everything would turn out all right.

to cause to know surely; reassure: He assured himself that no one was left on the bus.

to pledge or promise; give surety of; guarantee: He was assured a job in the spring.

to make (a future event) sure; ensure: This contract assures the company’s profit this month.

to secure or confirm; render safe or stable: to assure a person’s position.

to give confidence to; encourage.

Chiefly British. to insure, as against loss.

Words nearby assure















assured tenancy




assurnasirpal ii



Origin of assure

1325–75; Middle English as(e)uren, assuren

Old French


Late Latin


equivalent to

Latin as- as-





) +


thematic vowel +


infinitive suffix


as·sur·er, as·su·ror, nounin·ter·as·sure, verb (used with object), in·ter·as·sured, in·ter·as·sur·ing.pre·as·sure, verb (used with object), pre·as·sured, pre·as·sur·ing.un·as·sur·ing, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for assure

  • Nobody can assure anybody and some of these authorities at the crematorium have very little background in science.

  • There will be an early vote on the Keystone XL pipeline, which enough Democrats support to assure passage.

  • In giving freedom to the slave, we assure freedom to the free—honorable alike in what we give, and what we preserve.

  • I assure you there isn’t a single local businessman who doesn’t know the name Germán Goyeneche.

  • Having known a few presidents myself, I can assure you that there is little time to truly unwind, even on “vacation.”

  • “I assure you that maman’s doing it on purpose,” Liza thought necessary to explain to Shatov.

  • To assure himself, he raised her arm, which remained in the air until he placed it on the bed.

  • On a 1200 calorie schedule arranged as I have it you will not be hungry, I assure you.

  • I assure you it was a very “bad quarter of an hour” we passed in that boat; getting into it was difficult enough.

  • A week after, the fierce battle of Prague was fought—I can assure you your son behaved like a brave soldier.

British Dictionary definitions for assure


verb (tr; may take a clause as object)

to cause to feel sure or certain; convinceto assure a person of one’s love

to promise; guaranteehe assured us that he would come

to state positively or with assurance

to make (an event) certain; ensure

mainly British to insure against loss, esp of life

property law another word for convey

Derived forms of assure

assurable, adjectiveassurer, noun

Word Origin for assure

C14: from Old French aseürer to assure, from Medieval Latin assēcūrāre to secure or make sure, from sēcūrus secure

Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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