Coeternal

Part of speech: adjective

Definitions

1. Existing in the same time frame without beginning or end
2. Lasting forever together in a continuous and simultaneous existence
3. Having a simultaneous and unending presence from the beginning without cessation

Etymology: "Coeternal" is a plain compound: the prefix "co-", meaning "together" or "with," attached to "eternal." The prefix comes from Latin "con-," which took the form "co-" before vowels and certain consonants, and it reached English through Latin as a productive element that was often combined with existing words. "Eternal" itself is the older half of the pairing. It came into English from Old French "eternal," which descends from Latin "aeternalis," built from "aeternus," meaning "everlasting." Joining "co-" to it produced a term for things that share the same unending existence, a sense most often applied in theology to the relationship between eternal beings, such as the persons of the Trinity.

Synonyms: everlasting, eternal, timeless

Antonyms: temporary, transient, ephemeral, finite, momentary