Entry 1 sense Webster, 1913 Eternally · E·ter·nal·ly · IPA /ɪˈtɝ.nə.li/ 01 adv. In an eternal manner. 1. In an eternal manner. “That which is morally good or evil at any time or in any case, must be also eternally and unchangeably so.” — South. “Where western gales eternally reside.” — Addison.