/əˈriːnə/
arena
BrE /əˈriːnə/
NAmE /əˈriːnə/
a place with a flat open area in the middle and seats around it where people can watch sports and entertainment
a concert at Wembley Arena
(formal)
an area of activity that concerns the public, especially one where there is a lot of opposition between different groups or countries
the political/international arena