arena
n. countable C1 Advanced Oxford US //ɝˈinə// UK //ɐɹˈiːnɐ// are·na
n. a large area with seats all around it where people watch sports or music. It can also mean a specific area of activity, like politics or business.
n. a level area surrounded by seating, typically used for sports, concerts, or public performances. In a figurative sense, it refers to a sphere of intense activity, competition, or debate.
The band is playing at the local arena tonight.
The basketball team moved to a larger arena to accommodate their growing fan base.
As the senator entered the political arena, she realized that her academic background had not fully prepared her for the aggressive nature of public debate.
Usage
Often used with 'in the' when referring to a field of activity (e.g., 'in the political arena').