[en-shoor, -shur]
verb (used with object), ensured, ensuring.
to secure or guarantee: This letter will ensure you a hearing.
to make sure or certain: measures to ensure the success of an undertaking.
to make secure or safe, as from harm.
insure ( defs 1–3 ).

1350–1400; Middle English ensuren < Anglo-French enseurer. See en-1, sure

ensurer, noun
unensured, adjective

3. protect, guard, safeguard.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ensure or insure (ɛnˈʃʊə, -ˈʃɔː)
1.  (may take a clause as object) to make certain or sure; guarantee: this victory will ensure his happiness
2.  to make safe or secure; protect
insure or insure
en'surer or insure

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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Word Origin & History

late 14c., from Anglo-Fr. enseurer, from en- "make" + O.Fr. seur "sure," probably infl. by O.Fr. asseurer "assure." Related: Ensured; ensures; ensuring.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The large single panes ensure that there is no visual interruption between
  inside and outside.
We will ensure that these networks are secure, trustworthy and resilient.
Some measures are being taken to ensure economic and financial stability.
By revealing the crux of the story upfront, you pique interest and ensure you
  don't lose your own trail.
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