[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
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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
Before anyone's claim to celestial fame is ensured, however, new objects need
  to be certified as such.
These who have ensured their remembrance by their deserts.
If nothing else, this stance ensured that life sciences would become ever more
  inter- and multidisciplinary.
They picked a color of laser light that ensured the energy absorbed by the
  molecules would not set them spinning.
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