The wor aeon, also spelled eon or æon, means "age", "forever" or "for eternity". It is a Latin transliteration from the koine Greek word ὁ αἰών (aion), from the archaic αἰϝών, aiwon: in Homer it typically refers to life or lifespan, but by at least Hesiod it could refer to ages or generations. It has a similar meaning to the Sanskrit word kalpa and Hebrew olam. A cognate Latin word aevum or aeuum (cf. αἰϝών) for "age" is present in words such as longevity and mediæval.