milieu UK /ˈmiːljɜː/US /mɪlˈju/noun 3forms 2phrases 1 noun3 •An environment or setting; a medium; environsThe library as solely a physical space will not survive in the digital milieu. Services should be directed towards user needs and desires in the current academic climate. — 2013 •A social environment or setting. •A group of people with a common point of view; a social class or group. formsmilieus · milieux Phrases with milieu milieu controltactics that control environment and human communication through the use of peer pressure and group language.