IPA: //soʊˈsiːəblnəs//
KK: /soʊˈsiːəblnəs/
The quality of being friendly and enjoying the company of others.
Her sociableness made her popular at parties.
Sociableness → It is formed from "socius" (from Latin, meaning companion or ally) and the suffix "-ness" (meaning the state or quality of). The word "sociableness" refers to the quality of being sociable or inclined to seek companionship.
Think of 'socius' meaning companion, and remember that 'sociableness' describes the quality of being friendly and seeking companionship.