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Adjective: existential  ,eg-zi'sten-shul
  1. Derived from experience or the experience of existence
    "formal logicians are not concerned with existential matters";
    - experiential
  2. Of or as conceived by existentialism
    "an existential moment of choice"
  3. Relating to or dealing with existence (especially with human existence)

See also: empiric, empirical

Encyclopedia: Existential