n.[C]

1. （古罗马圆形剧场中央的）角斗场，竞技场
2. （周围有观众席的）比赛场，竞技场
   an arena for boxing matches

   拳击比赛场

3. 【喻】竞争场所，活动场所
   A member of congress works in the political arena.

   国会议员在政界活动。

4. （圆形剧场中央的）圆形舞台

n.

1. a level area surrounded by seating, in which public events and entertainments are held.
2. a sphere of activity:
   he's re-entered the political arena.