The word “apocalypse,” used in discussing a genre of biblical literature, comes from a Greek noun apokalypsis, which means “revelation,” “disclosure,” or “unveiling.” Apocalypse is a genre of revelatory literature with a narrative framework. Within this framework a revelation is mediated by an otherworldly being to a human recipient, disclosing a transcendental reality which is both temporal, insofar as it envisages eschatological salvation, and spatial, insofar as it involves another, supernatural world.