a.

1. 操作的；运行着的
   The airport is operative again after the bad weather.

   恶劣天气过后机场又重新运行了。

2. 从事生产劳动的
   the operative sections of a plant

   工厂的各生产部门

3. 起作用的；有效的
   an operative medicine

   有效的药物

4. 手术的

n.[C]

1. 技工，工人
2. 侦探，间谍

adj.

1. functioning; having effect.
   ▸(of a word) having the most significance in a phrase.
2. relating to surgery.

n.

1. a worker, especially one in a manufacturing industry.
2. chiefly N. Amer. a private detective or secret agent.