n.[C]

1. （古羅馬圓形劇場中央的）角鬥場，競技場
2. （周圍有觀眾席的）比賽場，競技場
   an arena for boxing matches

   拳擊比賽場

3. 【喻】競爭場所，活動場所
   A member of congress works in the political arena.

   國會議員在政界活動。

4. （圓形劇場中央的）圓形舞臺

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.