hereditary UK /həˈɹɛdɪt(ə)ɹi/US /həˈɹɛdɪˌtɛɹi/adjective 6noun 1forms 3 adjective6 •Passed on as an inheritance, by last will or intestate. •Of a disease or trait: passed from a parent to offspring in the genes.Haemophilia is hereditary in his family. •Of a title, honor or right: legally granted to somebody's descendant after that person's death.Duke is a hereditary title which was created in Norman times. •Of a person: holding a legally hereditary title or rank.hereditary rulers •Of a property of graphs: such that if G has the property, so must every induced subgraph of G. •Of a ring: such that all submodules of projective modules over the ring are also projective. noun1 •A hereditary ruler; a hereditary peer in the House of Lords. formshereditaries · more hereditary · most hereditary