ensure

[en-shoor, -shur]
verb (used with object), ensured, ensuring.
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

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)
 
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
Using an oven thermometer ensures that the oven is at the correct temperature
  for baking.
It ensures that instead of burying their mistakes, doctors learn from them.
Inside the gizmo, a network of grippers scurries up the line and ensures that
  it threads cleanly out the side.
It also ensures that some areas don't become overhunted.
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