This is the 404th most frequent Hungarian word.
téren
The Hungarian word "téren" means "in the field" or "in the area" (figuratively: in a specific domain or aspect).
Here, 'téren' refers to a physical square or plaza where the action of exhibiting is taking place.
A képek a téren vannak kiállítva.
The pictures are exhibited in the square.
Here, 'téren' again refers to a physical location, a square, indicating where the people are gathering.
A piacon túl, a téren gyülekeznek az emberek.
Beyond the market, people are gathering in the square.
In this sentence, 'téren' is used metaphorically to mean 'in the field of', indicating a specific area of knowledge or activity.