Sofa/ˈsəʊfə/ Definition 1 of 3Pro Tip 1/3Seating Comfort Used to indicate a relaxing seating option in homes or casual spaces. After work, he collapsed on the sofa for a quick rest. Pro Tip 2/3Informal Gatherings Refers to where people casually sit during social gatherings in a house. Guests gathered on the sofas, sharing stories and laughter. Pro Tip 3/3Shared Space Implies a piece of furniture meant for shared seating, unlike personal chairs. The family squeezed onto the sofa for movie night.