/lɒs/ noun
1. the state or process of not having something any more
loss of customers not keeping customers because of bad service, high prices, etc.
loss of an order not getting an order which was expected
the company suffered a loss of market penetration the company found it had a smaller share of the market
compensation for loss of earnings payment to someone who has stopped earning money or who is not able to earn money
compensation for loss of office payment to a director who is asked to leave a company before his or her contract ends
2. the state of having less money than before or of not making a profit
the company suffered a loss the company did not make a profit
to report a loss not to show a profit in the accounts at the end of the year
The company reported a loss of £1m on the first year’s trading.
the car was written off as a dead loss or a total loss the car was so badly damaged that the insurers said it had no value
at a loss making a loss, not making any profit
The company is trading at a loss.
We sold the shop at a loss.
to cut your losses to stop doing something which is losing money
3. damage to property or destruction of property, which is then subject to an insurance claim
the cargo was written off as a total loss the cargo was so badly damaged that the insurers said it had no value
‘…against losses of FFr 7.7m two years ago, the company made a net profit of FFr 300,000 last year’ [Financial Times]

Dictionary of banking and finance. 2015.