Lewis Short
(adjective) : aeternālis, e, aeternus
* Enduring forever, everlasting (often in inscrr.): aeternali somno sacrum,i. e. to death,Inscr. Grut. 752, 3: domus,Inscr. Orell. 4518: luctus,ib. 4604: memoria,ib. 200: lex temporalis et aeternalis,Tert. adv. Jud. 6.—Adv.: aeternālĭter, forever (late Lat.), Ad. ad H. Prud. March, p. 245.
Charlton T. Lewis, Charles Short, A Latin Dictionary