assure

[uh-shoor, uh-shur]
verb (used with object), assured, assuring.
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.
3.
to pledge or promise; give surety of; guarantee: He was assured a job in the spring.
4.
to make (a future event) sure; ensure: This contract assures the company's profit this month.
5.
to secure or confirm; render safe or stable: to assure a person's position.
6.
to give confidence to; encourage.
7.
Chiefly British. to insure, as against loss.

Origin:
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

assurer, assuror, noun
interassure, verb (used with object), interassured, interassuring.
preassure, verb (used with object), preassured, preassuring.
unassuring, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
assure (əˈʃʊə)
 
vb
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
3.  to state positively or with assurance
4.  to make (an event) certain; ensure
5.  chiefly (Brit) to insure against loss, esp of life
6.  property law another word for convey
 
[C14: from Old French aseürer to assure, from Medieval Latin assēcūrāre to secure or make sure, from sēcūrussecure]
 
as'surable
 
adj
 
as'surer
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

assure
late 14c., from O.Fr. asseurer (12c., Mod.Fr. assurer) "to reassure, calm, protect, to render sure," from V.L. *assecurar, from L. ad- "to" + securus "safe, secure" (see secure).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Let me assure you it is one of the best out there.
Perhaps he wants to assure fans that the series will continue to tackle
  controversial subjects.
Age recommendations assure the consumer that a book is appropriate and thus
  more likely to be enjoyed by the child.
He thinks it essential to help assure a successful debut, and then to hold on
  to an author through his or her writing career.
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