6 letters · 6 points in Scrabble
adjective of or relating to a geological eon (longer than an era)
adjective continuing forever or indefinitely
originFrom Ancient Greek αἰώνιος (aiṓnios, “lasting for an age; perpetual; eternal”) + -an, the former from αἰών (aiṓn, “lifetime; aeon; age; generation”) (whence also eon, aeon) + -ιος (-ios, adjective suffix).
Etymology from Wiktionary, CC BY-SA 3.0