/lɒs/ noun
1. 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
2. the state of having less money than before or 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/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. the state of being worth less or having a lower value
Shares showed losses of up to 5% on the Stock Exchange.
4. the state of weighing less
loss in weight goods which weigh less than when they were packed
loss in transport the amount of weight which is lost while goods are being transported
‘…against losses of FFr 7.7m two years ago, the company made a net profit of FFr 300,000 last year’ [Financial Times]

Marketing dictionary in english. 2015.