n.

1. 喪失；遺失[U]
   He suffered a temporary loss of memory.

   他暫時喪失了記憶。

2. 損失；虧損（額）[C][U]
   It is a great loss to her.

   這是她的巨大損失。

   His death means a great loss to science.

   他的死是科學的重大損失。

3. 輸，失敗[U][C]
   The loss of the first game did not discourage them.

   第一場比賽的失敗並沒有令他們沮喪。

4. 減少，減低[S1]
   When heavy atoms are split in this way some loss of mass occurs.

   當重原子這樣被分裂的時候，就會發生質量的減少。

n.

1. the fact or process of losing something or someone.
   ▸the feeling of grief after losing a valued person or thing.
   ▸a person or thing that is badly missed when lost.
2. a defeat in sport.
3. the amount by which money spent in operation or production exceeds money earned.