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Synonyms for Sociable (same or very similar meaning)

WordNet sense 1 (a party of people assembled to promote sociability and communal activity):
mixer

WordNet sense 2 (composed of sociable people or formed for the purpose of sociability):
social

WordNet sense 3 (occupied with or fond of the pleasures of good company):
convivial

WordNet sense 4 (suggestive of companionship):
companionable


From the ODE community, based on WordNetadd/edit