from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To inform positively, as to remove doubt: assured us that the train would be on time.
  • transitive v. To cause to feel sure: assured her of his devotion.
  • transitive v. To give confidence to; reassure.
  • transitive v. To make certain; ensure: "Nothing in history assures the success of our civilization” ( Herbert J. Muller).
  • transitive v. To make safe or secure.
  • transitive v. Chiefly British To insure, as against loss.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To make sure and secure.
  • v. To give (someone) confidence in the trustworthiness of (something).
  • v. To guarantee, promise (to do something).
  • v. To reassure.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To make sure or certain; to render confident by a promise, declaration, or other evidence.
  • transitive v. To declare to, solemnly; to assert to (any one) with the design of inspiring belief or confidence.
  • transitive v. To confirm; to make certain or secure.
  • transitive v. To affiance; to betroth.
  • transitive v. To insure; to covenant to indemnify for loss, or to pay a specified sum at death. See Insure.

from The Century Dictionary and Cyclopedia

  • To make sure or certain; convince or make confident, as by a promise, declaration, or other evidence: as, to assure a person of one's favor or love.
  • To declare solemnly to; assert earnestly to; endeavor to convince by assertion: as, I assure you I am speaking the truth.
  • To secure or confirm; make sure to be or to continue; give certainty or stability to: as, to assure a person's position or possessions.
  • To free from obscurity, ambiguity, or uncertainty.
  • To embolden; make confident.
  • To affiance; betroth.
  • To insure, as against loss.
  • To confide; trust.
  • To promise; pledge one's self.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. assure somebody of the truth of something with the intention of giving the listener confidence
  • v. make certain of
  • v. cause to feel sure; give reassurance to
  • v. be careful or certain to do something; make certain of something
  • v. inform positively and with certainty and confidence
  • v. make a promise or commitment


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English assuren, from Old French assurer, from Vulgar Latin *assēcūrāre, to make sure : Latin ad-, ad- + Latin sēcūrus, secure; see secure.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Old French asseürer (Modern French assurer), from Latin ad- + securus ("secure").


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  • Shakspeare's day and that of our own, I call assure him that I am not quite so ignorant of the fact as he imagines.

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  • May I again assure you how deeply grateful I am to you for having given me the opportunity of coming amongst you today.

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  • [Page 87] pleasures of the theatre; unless it be, my having been persuaded, five years ago, to attend it one evening; – and though, certainly, I am not aware of having sustained any material injury, either to my moral or spiritual feelings, I have ever since decidedly resolved never to repeat the visit; and I hope you will believe me when I once again assure you that I do disapprove of such amusements; and should think it very dangerous, and exceedingly wrong to be in the habit of frequenting them.

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  • In terms of our refinancing strategy or debt financing strategy, let me simplify it as best as I can assure, which is everything that's on our balance sheet today, our intend is to pay off as it comes due.


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