a.[Z]

1. 相互的，彼此的
   Mutual understanding is essential to friendship.

   相互理解對友誼至關重要。

2. 共有的，共同的
   We found that we had a mutual friend.

   我們發現我們有一個共同的朋友。

adj.

1. experienced or done by each of two or more parties towards the other or others:
   mutual respect.
   ▸(of two or more parties) having the same specified relationship to each other.
2. held in common by two or more parties:
   a mutual friend.
3. denoting a building society or insurance company owned by its members and dividing some or all of its profits between them.