sociability

Concise Oxford English Dictionary © 2008 Oxford University Press:
sociable/ˈsəʊʃəbl/

▶adjective engaging readily with other people.

■ marked by friendliness.

▶noun

• 1 historical an open carriage with facing side seats.

• 2 historical a tricycle with two seats side by side.

• 3 chiefly Brit. an S-shaped couch for two people who sit partially facing each other.

• 4 US dated an informal social gathering.

– derivatives
sociability noun,
sociableness noun,
sociably adverb.

– origin C16: from Fr., or from L. sociabilis, from sociare ‘unite’, from socius ‘companion’.