n.

1. 场合，时刻；重大活动，盛典[C]
2. 时机，机会[S][（+for）]
   He seized the occasion to invite her home for dinner.

   他抓住机会邀请她回家里吃饭。

3. 起因，近因[S][（+of）]
   Her departure was the occasion of much sadness.

   她的离别是令人十分悲伤的起因。

4. 理由；需要[U][（+for）][+to-v]
   You have no occasion to buy another car.

   你没有必要再买一辆汽车。

vt.

1. 引起；惹起[O1]
   His rude behavior occasioned a quarrel.

   他的无礼行为引起了一场争吵。

n.

1. a particular event, or the time at which it takes place.
   ▸a suitable or opportune time.
2. a special event or celebration.
3. formal reason; cause:
   we have occasion to rejoice.

v.