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Equally or jointly eternal.

co′e·ter′nal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


existing together eternally
ˌcoeˈternally adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Hail holy light, ofspring of Heav'n first-born, Or of th' Eternal Coeternal beam May I express thee unblam'd?
The Trinity Doctrine holds that God is one God, but three coeternal consubstantial persons the Father, the Son, and the Holy Spirit as "one God in three Divine Persons".
creature, which, although no ways coeternal unto Thee, the Trinity, yet
"This is partly because they are in Welsh but also because the language is not understood - words like 'coeternal', 'consubstantial', 'ineffably sublime' are a bit of a mouthful today's youngsters - they don't know what they mean.
Moreover, the Supreme Being includes no contingency regarding the causation of the demiurgic Creator; because being the Source of all existence, He is coexistent and coeternal with the 'Suns', His eternal heavenly manifestations, one of whom is Mbumba Lowa, the creator of our universe.
(13) Matter is therefore not uncreated or coeternal with God.
Muslims too may wonder if Derrida's claim that messianicity supersedes even Quranic revelation, or belief in an uncreated and coeternal Book, is not a disingenuous strategy for asserting the cultural hegemony of a historically specific universalism, one that has more in common with Judaic religion than either Islam or Christianity.
Despair followed by resignation in front of the fatality of the vast cosmic mechanism governed by periodic storms and disasters; the reference here to the equinox surely makes reference to the time when light and darkness are equal: this is when the fight is strongest, when the two coeternal opposites (good and evil, light and darkness) struggle for supremacy.
As the eternally begotten self-expression of the one, true, infinite and eternal God, the Son is coequal and coeternal with the Father.
In one of his several creation sequences, Hesiod makes Night and Eros coeternal to Gaia who both brings forth Ouranos, "without any act of love" and takes him as a husband with consequences essential to discussion of the Woman of Trachis.
Your wisdom is manifestly coeternal and equal with you,
spectacularizes O'Grady's ongoing condition of being both part of and not part of, inside and outside, a society that relies on coeternal binary opposition.