[in-shoor-uhns, -shur-]
the act, system, or business of insuring property, life, one's person, etc., against loss or harm arising in specified contingencies, as fire, accident, death, disablement, or the like, in consideration of a payment proportionate to the risk involved.
coverage by contract in which one party agrees to indemnify or reimburse another for loss that occurs under the terms of the contract.
the contract itself, set forth in a written or printed agreement or policy.
the amount for which anything is insured.
an insurance premium.
any means of guaranteeing against loss or harm: Taking vitamin C is viewed as an insurance against catching colds.
of or pertaining to a score that increases a team's lead and insures that the lead will be held if the opposing team should score once more: The home run gave the team an insurance run, making the score 7-5.

1545–55; insure + -ance

noninsurance, noun
preinsurance, noun
proinsurance, adjective

assurance, insurance. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insurance (ɪnˈʃʊərəns, -ˈʃɔː-)
1.  a.  the act, system, or business of providing financial protection for property, life, health, etc, against specified contingencies, such as death, loss, or damage, and involving payment of regular premiums in return for a policy guaranteeing such protection
 b.  the state of having such protection
 c.  Also called: insurance policy the policy providing such protection
 d.  the pecuniary amount of such protection
 e.  the premium payable in return for such protection
 f.  (as modifier): insurance agent; insurance broker; insurance company
2.  a means of protecting or safeguarding against risk or injury

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1553, "engagement to marry," a variant of ensurance (see ensure). Commercial sense of "security against loss or death in exchange for payment" is from 1651. Assurance was the older term for this (late 16c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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