vt.

1. 结束[（+by/with）]
   We concluded our meeting at 9 o'clock.

   我们九点钟结束了会议。

2. 推断出，断定[W][Y][+that]
   What can you conclude from these observations?

   你从这些观察中能得出什么结论？

3. 缔结（条约）[（+with）]
4. （最后）决定（为）[+to-v][+that]
   He concluded that he would wait a little longer.

   他决定再等一会儿。

   He concluded to quit on pay day.

   他决定在发薪水这天辞职。

vi.

1. 结束，终了[（+with）]
   The meeting concluded after two hours.

   两小时后会议结束了。

2. 断定
3. 达成协议
4. 作出（最后）决定

v.

1. bring or come to an end.
   ▸formally settle or arrange (an agreement).
2. arrive at a judgement or opinion by reasoning.