coeternal

from The Collaborative International Dictionary of English v.0.48

Coeternal \Co`e*ter"nal\, a.
   Equally eternal. -- {Co`e*ter"nal*ly}, adv.
   [1913 Webster]

         Hail, holy Light, offspring of Heaven first born!
         Or of the Eternal coeternal beam.        --Milton.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

56 Moby Thesaurus words for "coeternal":
      accompanying, ageless, agreeing, ceaseless, coetaneous, coeval,
      coexistent, coexisting, coinstantaneous, collateral, concomitant,
      concurrent, constant, contemporaneous, contemporary, conterminous,
      continual, continuous, coterminous, dateless, endless, eternal,
      eterne, ever-being, ever-durable, ever-during, everlasting,
      everliving, immemorial, incessant, indestructible, infinite,
      interminable, isochronal, isochronous, never-ceasing, never-ending,
      nonstop, nonterminating, nonterminous, olamic, perdurable,
      permanent, perpetual, sempiternal, simultaneous, steady, timeless,
      unceasing, unending, unintermitting, uninterrupted, unison,
      unisonous, unremitting, without end