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1620s, "raised section of a floor, covered with carpets and cushions," from Turkish sofa, from Arabic suffah "bench of stone or wood; a couch." Meaning "long stuffed seat for reclining" is recorded from 1717.
an upholstered seat with back and arms (sometimes upholstered), designed to accommodate two or more people in a sitting or reclining position. The earliest surviving types, dating back to the 17th century in Europe, have sides that let down for conversion into a bed. Variations of backrests and armrests appeared, and the precedent, still followed in the 21st century, was established of making the settee part of a matched set of chairs.