(n): the totality of surrounding conditions
(n): the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand
(n): a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
(n): a large structure for open-air sports or entertainments
(n): a thing constructed; a complex entity constructed of many parts
(n): a playing field where sports events take place
(n): a piece of land prepared for playing a game
AREnA
"an era" in reverse