αἰών
Etym. poet.: apocop. acc. αἰῶ
Etym. properly αἰϝών, "aevum", v. αἰεί）
"a period of existence":
1. "one's life-time, life", Hom. and attic Poets.
2. "an age, generation", Aesch.; ὁ μέλλων αἰών "posterity", Dem.
3. "a long space of time, an age", ἀπ᾽ αἰῶνος "of old, for ages", Hes., NTest.; τὸν δι᾽ αἰῶνος χρόνον "for ever", Aesch.; ἅπαντα τὸν αἰ. Lycurg.
4. "a definite space of time, an era, epoch, age, period", ὁ αἰὼν οὗτος this present "world", opp. to ὁ μέλλων, NTest.:—hence its usage in pl., εἰς τοὺς αἰῶνας "for ever", id=NTest.