ADJ

Olympic
showjumping, sports
indoor

VERB + ARENA

enter
leave
He left the arena to loud applause

PREP

in/into an/the ~
The rider has to halt the horse in the arena

ADJ

international, world
wider
Trades unions are active both in individual workplaces and in the wider arena of the state
public
commercial, political
competitive

VERB + ARENA

provide
The conference should provide an arena for marketing our new products
emerge into, enter, move into
Some documents have now emerged into the public arena. He had no desire to enter the political arena

PREP

in/within an/the ~
The company has been very successful in the commercial arena
outside an/the ~
I want to work outside the arena of competition