gentilitial adjective 3noun 1forms 3 adjective3 •Synonym of gentilicial.Occasionally – as for example in the paintings of the Tomb of the Inscriptions at Tarquinii – members of the gentilitial class to which the family of the dead man belonged may also be seen dancing. — 1955 •(no longer used) specific to a people; national •(no longer used) hereditary; entailed on a family noun1 •Synonym of gentilicial. formsgentilitials · more gentilitial · most gentilitial