doomsday Meaning, Definition & Usage

  1. noun (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
    Day of Judgment; Day of Judgement; Judgment Day; Last Judgment; Judgement Day; eschaton; crack of doom; day of reckoning; end of the world; Last Day; Last Judgement.
  2. noun an unpleasant or disastrous destiny
    day of reckoning; doom; end of the world.
    • 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

WordNet

Dooms"day` noun
Etymology
AS. dmes dag. See Doom, and Day.
Definitions
  1. A day of sentence or condemnation; day of death. "My body's doomsday." Shak.
  2. The day of the final judgment.
    I could not tell till doomsday. Chaucer.

Webster 1913