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

See also: empiric, empirical

Encyclopedia: Existential