n.

1. 远征；探险；考察[C]
   They did an expedition to the Himalayas.

   他们到喜马拉雅山去考察了一次。

2. 远征队；探险队；考察队[C]
   He was on an expedition to explore the Antarctic.

   他参加探险队远征南极。

3. 迅速，敏捷[U]

n.

1. a journey undertaken by a group of people with a particular purpose.
2. formal promptness or speed in doing something.