a.

1. 完全一樣的；複製的；副本的
   He opened the door with a duplicate key.

   他用一把複製的鑰匙打開了門。

2. 二重的；一對的；二倍的
3. 【牌】複局的

n.

1. 完全一樣的東西；複製品；副本[C]
   Keep a duplicate of the letter.

   保存一份信的副本。

2. 【牌】複局

vt.

1. 複製；複寫；影印，拷貝
   All the members received duplicated notices of the meeting.

   所有會員都接到同樣的會議通知。

2. 重複
3. 使成雙；使加倍

adj.

1. exactly like something else, especially through having been copied.
2. having two corresponding parts.

n.

v.