Loss is the fact of no longer having something or having less of it than before.

Loss of life occurs when people die.

The loss of a relative or friend is their death.

If a business makes a loss, it earns less than it spends.

Loss is the feeling of sadness you experience when someone or something you like is taken away from you.

A loss is the disadvantage you suffer when a valuable and useful person or thing leaves or is taken away.

The loss of something such as heat, blood, or fluid is the gradual reduction of it or of its level in a system or in someone's body.

If a business produces something at a loss, they sell it at a price which is less than it cost them to produce it or buy it.

If you say that you are at a loss, you mean that you do not know what to do in a particular situation.

If you cut your losses, you stop doing what you were doing in order to prevent the bad situation that you are in becoming worse.

If you say that someone or something is a dead loss, you have a low opinion of them because you think they are completely useless or unsuccessful.