[ uh-shoor, uh-shur ]
See synonyms for: assureassuredassuring on

verb (used with object),as·sured, as·sur·ing.
  1. to declare earnestly to; inform or tell positively; state with confidence to: She assured us that everything would turn out all right.

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

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

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

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

  4. to give confidence to; encourage.

  5. Chiefly British. to insure, as against loss.

Origin of assure

First recorded in 1325–75; Middle English as(e)uren, assuren, from Old French aseurer, from Late Latin assēcūrāre, from Latin as- as- + sēcūr(us) (see secure) + -āre, infinitive suffix

Other words from assure

  • as·sur·er, as·su·ror, noun
  • in·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. 2024

How to use assure in a sentence

British Dictionary definitions for assure


/ (əˈʃʊə) /

verb(tr; may take a clause as object)
  1. to cause to feel sure or certain; convince: to assure a person of one's love

  2. to promise; guarantee: he assured us that he would come

  1. to state positively or with assurance

  2. to make (an event) certain; ensure

  3. mainly British to insure against loss, esp of life

  4. property law another word for convey

Origin of assure

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

Derived forms of assure

  • assurable, adjective
  • assurer, noun

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