as·sure

[uh-shoor, uh-shur]
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.
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

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To assure
00:10
Assure is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
assure (əˈʃʊə) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
It will work miracles, I assure you.
Perhaps he wants to assure fans that the series will continue to tackle
  controversial subjects.
Celebrity ownership does not always assure top dollar.
Rather, people learned to cultivate edible plant and animal foods to assure a
  more constant food supply.
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