coeternal

enUK

co·e·ter·nal

C0456200 (kō′ĭ-tûr′nəl)adj. Equally or jointly eternal.
co′e·ter′nal·ly adv.

coeternal

(ˌkəʊɪˈtɜːnəl) adjexisting together eternally ˌcoeˈternally adv