Changes in meaning from the Second Century A.D. to the present time
From the Second Century A.D. onward, the term "Apocalypse" was applied to a number of books, both Jewish and Christian, which show the same characteristic features.
Besides the Apocalypse of John (now generally called the Book of Revelation) included in the New Testament, the Muratorian fragment, Clement of Alexandria, and others mention an Apocalypse of Peter. Apocalypses of Adam and Abraham (Epiphanius) and of Elias (Jerome) are also mentioned; see, for example, the six titles of this kind in the "List of the 60 Canonical Books"; and also Development of the New Testament canon.
The use of the Greek noun to designate writings belonging to a certain literary genre is of Christian origin, the original norm of the class being the New Testament Book of Revelation. In 1832 Gottfried Christiane explored the word "Apocalypse" as a description of the book of Revelation.