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

See also: lasting, permanent