the ratio of the losses paid or accrued by an insurer to premiums earned, usually for a period of one year.
Origin of loss ratio
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the ratio of the annual losses sustained to the premiums received by an insurance company
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