semperidentical UK /ˌsɛmpəɹaɪˈdɛntɪkəl/US /ˌsɛmpəɹɪˈdɛntɪkəl/ adjective1 •(rare) Remaining always the same; unvarying with the passage of time.That perfectly semperidentical display of idiosyncratic egotism which runs through…all his varieties. — 1820
