insurance in which those insured become members of a company who reciprocally engage, by payment of certain amounts into a common fund, to indemnify one another against loss.
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British Dictionary definitions for mutual insurance
a system of insurance by which all policyholders become company members under contract to pay premiums into a common fund out of which claims are paidSee also mutual (def. 3)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012