societal UK [səˈsaɪ.ɪ.tɫ̩]US [səˈsaɪ.ə.tɫ̩] adjective1 •Of or pertaining to society or social groups, or to their activities, customs, etc.But his real legacy, which has touched each of us more than we will likely ever know, centers around a rather simple notion of spontaneous order of societal development. — 1992 formsmore societal · most societal