The word 'stadium' is a noun, a singular, common, concrete noun; a word for a type of building, a word for a thing. A noun functions in a sentence as the subject of a sentence or a clause, and as the object of a verb or a preposition. Example: My dad is taking me to a stadium to watch a football game.
The crowd in the stadium was being ludicrous to the goal.
The spectators on the highest stadium-tier had poor visibility.
I went to the cool stadium to see the Olympics play and it was cool.
He was asked to leave the stadium because of his loud, drunken, boorish behavior.
A group of raucous youths ran around the stadium causing mayhem
The hooligans caused chaos at the soccer match by starting fights in the stadium.
No. Stadium is a noun, the object of the preposition "to." However, the prepositional phrase "to the stadium" is an adverb phrase.
She used a megaphone to project her voice across the crowded stadium.
I got lost in the stadium. The stadium is just two stadia from here. I can't believe how many seats the proposed stadium will have!
Taxes will only be slightly increased so that the city can build a new stadium. The old stadium is crumbling.
It is the same in Latin: stadium.