[uh-shoo r, uh-shur]

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

Origin of assure

1325–75; Middle English as(e)uren, assuren < Old French aseurer < Late Latin assēcūrāre, equivalent to Latin as- as- + sēcūr- (see secure) + -ā- thematic vowel + -re infinitive suffix
Related formsas·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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for assure

Contemporary Examples of assure

Historical Examples of assure

  • Those Westerners perform quite in that manner, I assure you.

    The Spenders

    Harry Leon Wilson

  • He could assure them they felt highly flattered at the reception which had been accorded them.

  • Oh, ma'am—you're very polite—I feel it a great compliment, I assure you.

  • Much against my liking, I assure you, said my brother, rudely interrupting her.

    Clarissa, Volume 1 (of 9)

    Samuel Richardson

  • But I know what your duties will be, and I assure you, my dear Hester, you will find the thing cannot be done.

    Weighed and Wanting

    George MacDonald

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 Formsassurable, 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

Word Origin and History for assure

late 14c., from Old French asseurer (12c., Modern French assurer) "to reassure, calm, protect, to render sure," from Vulgar Latin *assecurar, from Latin ad- "to" (see ad-) + securus "safe, secure" (see secure (adj.)). Related: Assured; assuring.

Online Etymology Dictionary, © 2010 Douglas Harper