What does "mystical" mean?

Mystical: Importing or implying mysticism; involving some secret meaning; allegorical; emblematical; as, a mystic dance; mystic Babylon. Thus, then, did the spirit of unity and meekness inspire every joint and sinew of the mystical body. Milton. -- Mys"tic*al*ly, adv. -- Mys"tic*al*ness, n.