interrelationship UK /ˌɪntə.ɹɪˈleɪ.ʃən.ʃɪp/US /ˌɪntɚ.ɹɪˈleɪ.ʃən.ʃɪp/adjective 1noun 1forms 1 adjective1 •Between multiple relationships; interrelation noun1 •A relationship between multiple things. formsinterrelationships