noun
parade ground; drill ground
A military training area used for drills, parades, and exercises. Often associated with historical or formal military contexts.
兵士たちは練兵場で行進の練習をした。
The soldiers practiced marching on the parade ground.
Compound of 練兵 (renpei, 'drill, training of soldiers') + 場 (jō, 'place, ground'). The exact historical derivation is uncertain, but the term is conventionally associated with military parade grounds.