Muggletonian UK /ˌmʌɡəlˈtəʊ.ni.ən/US /ˌmʌɡəlˈtoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •(historical) Of or pertaining to this sect or its followers. noun1 •(historical) A member of a small Protestant Christian sect most prominent in 17th- and 18th-century England. formsMuggletonians · more Muggletonian · most Muggletonian