Etymology: Middle English los, probably back-formation from lost, past participle of losen to lose
Date: 13th century
1:destruction, ruin 2 a: the act of losing possession :deprivation<loss of sight>b: the harm or privation resulting from loss or separation c: an instance of losing 3: a person or thing or an amount that is lost: as aplural: killed, wounded, or captured soldiers b: the power diminution of a circuit or circuit element corresponding to conversion of electrical energy into heat by resistance 4 a: failure to gain, win, obtain, or utilize b: an amount by which the cost of something exceeds its selling price 5: decrease in amount, magnitude, or degree 6: the amount of an insured's financial detriment by death or damage that the insurer is liable for
ā at a loss1: uncertain as to how to proceed <was at a loss to explain the discrepancy> 2: unable to produce what is needed <at a loss for words>
ā for a loss: into a state of distress <events had thrown him for a loss>