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to declare earnestly to; inform or tell positively; state with confidence to:
She assured us that everything would turn out all right.
to cause to know surely; :
He assured himself that no one was left on the bus.
to pledge or promise; give surety of; guarantee:
He was assured a job in the spring.
to make (a future event) sure; ensure:
This contract assures the company’s profit this month.
to secure or confirm; render safe or stable:
to assure a person’s position.
to give confidence to; encourage.
Chiefly British. to insure, as against loss.
Contemporary Examples

Are there really no code-based controls for assuring that specific surveillance is specifically justified?
It’s Time to Rewrite the Internet to Give Us Better Privacy, and Security Lawrence Lessig June 11, 2013

A cartoon on the final weekend showed Bill Clinton assuring a box with air holes, “Only a few days more, Hillary.”
Everyone Sees the Hillary They Want to See Eleanor Clift June 16, 2014

This is especially important when it comes to assuring the kind of growth rates that Wall Street expects.
The Coming War Over Innovation John Kao May 2, 2010

He continued, assuring the nominees that this was the one award that would have no impact on their careers.
‘The Artist’ Sweeps at Independent Spirit Awards Richard Rushfield February 25, 2012

In fact, a failure to act would have worsened our long-term deficit by assuring weak economic growth for years.
‘We Will Recover’ Barack Obama February 24, 2009

Historical Examples

I telegraphed at once to the governor, assuring him of my interest in the case and requesting information.
Shining Ferry Sir Arthur Thomas Quiller-Couch

And that for one who had apparently deceived her in assuring her that her heart was free?
Clarissa, Volume 2 (of 9) Samuel Richardson

He crushed her against him and returned her kisses, assuring her that she was.
Graveyard of Dreams Henry Beam Piper

assuring Adams therefore of this truth, he begged him to give some account how he came there.
Joseph Andrews, Vol. 2 Henry Fielding

He had been very steady in assuring these wretched ones that they might go or stay, as they pleased.
John Caldigate Anthony Trollope

verb (transitive; may take a clause as object)
to cause to feel sure or certain; convince: to assure a person of one’s love
to promise; guarantee: he assured us that he would come
to state positively or with assurance
to make (an event) certain; ensure
(mainly Brit) to insure against loss, esp of life
(property law) another word for convey
v.

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.