A·poc·a·lypse (Noun) The Book of Revelation, anonymous Jewish or Christian texts from around the second century B.C. containing prophetic visions of the imminent destruction of the world and the salvation of the righteous. Great or total devastation; doom: the apocalypse of nuclear war.A prophetic disclosure; a revelation. Ca·lyp·so (Noun). music that originated in the West Indies and is characterized by improvised lyrics on topical or broadly humorous subjects.