Extended Strong's Greek Lexicon (Abbott-Smith based)
eternal
Usage: αἰώνιος, -ον (as usual in Attic), also -α, -ον. 2Th.2:16, Heb.9:12; (αἰών), [in LXX chiefly for עוֹלָם ;] age-long, eternal, __(a) of that which is without either beginning or end: Rom.16:26, Heb.9:14; __(b) of that which is without beginning: Rom.16:25, 2Ti.1:9, Tit.1:2; __(with) of that which is without end (MM, VGT, see word): σκηναί, Luk.16:9 οἰκία, 2Co.5:1; διαθήκη, Heb.13:20; εὐαγγέλιον, Rev.14:6; παράκλησις, 2Th.2:16; λύτρωσις, Heb.9:12; κληρονομία, ib. 15; κόλασις, Mat.25:46; κρίμα, Heb.6:2;
κρίσις, Mrk.3:29; ὄλεθρον, 2Th.1:9; πῦρ, Mat.18:8; frequently with ζωή, which see SYN.: ἀΐδιος, which see (AS)