- loss [lôs, läs]n.[ME los < pp. of losen, lesen, to LOSE]1. a losing or being lost2. an instance of this3. the damage, trouble, disadvantage, deprivation, etc. caused by losing something4. the person, thing, or amount lost5. any reduction, lessening, etc. [a loss of strength, power, etc.]6. any reduction of heat energy, electrical energy, etc. in a system, esp. the reduction of power, voltage, or current in a circuit due to the resistance of the components7. Insurancea) death, injury, damage, etc. that is the basis for a valid claim for indemnity under the terms of an insurance policyb) the amount paid by the insurer on this basis8. Mil.a) the losing of military personnel in combat by death, injury, or captureb) [pl.] those lost in this wayc) [pl.] ships, aircraft, etc. lost in battle——————at a loss1. in an uncertain or perplexed state; puzzled2. so as to lose money [to operate a business at a loss]3. not able to; uncertain how to: followed by an infinitive [he was at a loss to explain the missing funds]
English World dictionary. V. Neufeldt. 2014.