noun, noun which may take the genitive case particle 'no'
fourfold; quadruple
Used to describe something that is four-layered, four times as much, or consisting of four parts. Often appears in compounds like 四重奏 (quartet) or 四重の塔 (four-storied pagoda).
四重の塔が遠くに見える。
A four-storied pagoda is visible in the distance.
四重奏の演奏を聴きに行った。
I went to listen to a quartet performance.