1) Existentialist concept 
In philosophy, `the Absurd` refers to the conflict between (1) the human tendency to seek inherent value and meaning in life and (2) the human inability to find any. In this context absurd does not mean `logically impossible`, but rather `humanly impossible`. The universe and the human mind do not each separately cause the Absurd, but rather...
doctrine that we live in an irrational universe
philosophy stating that the efforts of man to find meaning in the universe will ultimately fail because no such meaning exists (at least in relation to man). Absurdism is related to existentialism, though should not be confused with it, nor nihilism.
the philosophical and literary doctrine that human beings live in essential isolation in a meaningless and irrational world.