a long, upholstered couch with a back and two arms or raised ends.

1615–25; < Turkish < Arabic ṣuffah platform used as a seat Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sofa (ˈsəʊfə)
an upholstered seat with back and arms for two or more people
[C17 (in the sense: dais upholstered as a seat): from Arabic suffah]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1625, "raised section of a floor, covered with carpets and cushions," from Turk. sofa, from Ar. suffah "bench." Meaning "long stuffed seat for reclining" is recorded from 1717.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Then she set either her homemade detector or a commercial one in each apartment
  near a typical bug haven, such as the sofa.
They would stumble about on the queen-size sofa in her room, neither of them
  really knowing what to do.
They slept in the same bed because she could not tell him to use the sofa and
  because she liked having them beside her.
We sat side by side on a sofa in the corner of the lobby and watched the
  snowflakes dance outside the window.
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