n.

1. 仪式，典礼[C][U]
2. （宗教等）仪式的举行[C][U]
3. 礼仪书[C]
4. 例行公事；老规矩；习惯[C]
   She went through her usual ritual of making sure all the doors were locked before she went to bed.

   她上床之前按惯例检查一下所有的门是不是都锁上了。

a.

1. （宗教）仪式的，典礼的[Z][B]

n.

1. a religious or solemn ceremony involving a series of actions performed according to a prescribed order.
   ▸a prescribed order of performing such a ceremony.
2. a series of actions habitually and invariably followed by someone.

adj.