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Adjective: aeonian  ee'ow-nee-un
  1. Continuing forever or indefinitely
    "the aeonian themes of love and revenge";
    - ageless, eonian [N. Amer], eternal, everlasting, perpetual, unending, unceasing, eviternal [archaic]
  2. Of or relating to a geological eon (longer than an era)
    - eonian [N. Amer]

See also: lasting, permanent