social (relating to society) / social (relating to business firms) / social; outgoing; extroverted / social (living in large groups) / for use by the residents of an apartment block, as opposed to maintenance workers or deliverymen

(Brazil, informal) a small party between close people or friends

social climber (someone who tries to improve their social position)

social Darwinism (theory)

social worker (person whose profession is social work)

(philosophy, politics) social contract (implicit agreement among members of a society) / (business) articles of association (document that defines the responsibilities of the directors of a company)

social insect (insect species whose members form colonies)

(psychiatry) social anxiety disorder (intense fear in social situations)

(chiefly Portugal) welfare (aid provided by a government to the poor)

(chiefly Brazil) welfare (aid provided by a government to the poor)