demitarian UK /ˌdɛ.miˈtɛə.ɹi.ən/US /ˌdɛ.miˈtɛ.ɹi.ən/ adjective1 •Of or relating to the type of diet in which meat consumption is reduced to half of what is culturally typical; of or relating to demitarianism.Nitrogen budget of the agricultural system of the Seine watershed for the current situation (2006) and the organic and local (OrgLoc) and organic, local and demitarian (OrgLocDem) scenarios. — 2014 formsmore demitarian · most demitarian