[in-shoor, -shur]
verb (used with object), insured, insuring.
to guarantee against loss or harm.
to secure indemnity to or on, in case of loss, damage, or death.
to issue or procure an insurance policy on or for.
ensure ( defs 1–3 ).
verb (used without object), insured, insuring.
to issue or procure an insurance policy.

1400–50; late Middle English; variant of ensure

overinsure, verb (used with object), overinsured, overinsuring.
preinsure, verb (used with object), preinsured, preinsuring.

1. warrant. 4. assure. Unabridged
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

insure (ɪnˈʃʊə, -ˈʃɔː)
1.  (often foll by against) to guarantee or protect (against risk, loss, etc): we insured against disappointment by making an early reservation
2.  (often foll by against) to issue (a person) with an insurance policy or take out an insurance policy (on): his house was heavily insured against fire; after all his car accidents the company refuses to insure him again
3.  ensure another word (esp US) for ensure

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

c.1440, variant of ensuren (see ensure). Took on its particular sense of "make safe against loss by payment of premiums" 1635 (replacing assure in that meaning).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In order to insure that the tools of privacy are available to all, individual
  acts of heroism are required.
Insofar as people find themselves unable to insure against the significant
  dangers of life, there is a role for government.
The only solution is to increase publishing, to insure a record of such work is
  created and maintained.
High bandwidths are required for this as employers will require monitoring to
  insure that their employees are actually working.
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