noun
chamber orchestra
A small orchestra, typically with one player per part, performing in a more intimate setting than a full symphony orchestra.
彼は室内管弦楽団でバイオリンを弾いている。
He plays the violin in a chamber orchestra.
Compound of 室内 (indoor, chamber) + 管弦楽 (orchestral music) + 団 (group). The term is a direct translation of the English 'chamber orchestra'.