en·sure

[en-shoor, -shur]
verb (used with object), en·sured, en·sur·ing.
1.
to secure or guarantee: This letter will ensure you a hearing.
2.
to make sure or certain: measures to ensure the success of an undertaking.
3.
to make secure or safe, as from harm.
4.
insure ( defs 1–3 ).

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

en·sur·er, noun
un·en·sured, adjective


3. protect, guard, safeguard.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
ensure or insure (ɛnˈʃʊə, -ˈʃɔː) [Click for IPA pronunciation guide]
 
vb
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
 
vb
 
en'surer or insure
 
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

ensure
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 author takes great care to ensure that readers understand the feelings
  behind the memories.
Many officers disapproved, and headquarters on both sides took strong steps to
  ensure that it could never happen again.
Power-chips can also switch between grid and stored power in milliseconds to
  ensure uninterrupted power.
They will also ensure that their areas have been represented in the compilation
  of the shaking map.
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