Apocalypse :: Apocalypse (n.) The revelation delivered to St. John, in the isle of Patmos, near the close of the first century, forming the last book of the New Testament..
Apocalypse :: Apocalypse (n.) Anything viewed as a revelation; a disclosure.
Apocalyptical :: Apocalyptical (a.) Of or pertaining to a revelation, or, specifically, to the Revelation of St. John; containing, or of the nature of, a prophetic revelation..
Apocalyptically :: Apocalyptically (adv.) By revelation; in an apocalyptic manner.