A long upholstered seat typically with a back and arms.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sofa" in a sentence
"What your seeing in pics is ONLY the "Love seat", the * sofa* is larger/longer of course (unable to take pic of sofa since it lies underneath the loveseat, no room for pic)"
"A sofa is a word adapted into English from Arabic, by way of Aramaic."
"Your discovery of a glass eye in the fold of your sofa is a lucky omen."