An event caused naturally or artificially which leads to the end of the world, i.e. of humanity or planet Earth.
an unpleasant or disastrous destiny; "everyone was aware of the approaching doom but was helpless to avoid it"; "that''s unfortunate but it isn''t the end of the world"
(New Testament) day of the Last Judgment when God will decree the fates of all men according to the good and evil of their earthly lives
an unpleasant or disastrous destiny
(New Testament) day at the end of time following Armageddon when God will decree the fates of all individual humans according to the good and evil of their earthly lives