a.

1. 操作的；運行著的
   The airport is operative again after the bad weather.

   惡劣天氣過後機場又重新運行了。

2. 從事生產勞動的
   the operative sections of a plant

   工廠的各生產部門

3. 起作用的；有效的
   an operative medicine

   有效的藥物

4. 手術的

n.[C]

1. 技工，工人
2. 偵探，間諜

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.