sectional
n. countablen. a large sofa made of several separate pieces that you can arrange in different ways. It is great for big families because it fits into corners and provides lots of seating.
n. a piece of upholstered furniture consisting of multiple modular units that can be configured in various arrangements. Often used in interior design to maximize seating in living areas.
We bought a large sectional for our new living room.
The family chose a grey velvet sectional because the modular pieces allowed them to fit it perfectly into the corner of the den.
While traditional sofas offer a fixed silhouette, a sectional provides the flexibility to adapt the seating arrangement to the specific architectural constraints of a modern open-plan living space.
Commonly used in North American English; in British English, 'modular sofa' or 'corner sofa' is more frequent.