Abarim Publications' online Biblical Greek Dictionary
The adverb αυριον (aurion) means tomorrow, on the morrow or morning (and may occasionally be used figuratively to mean soon or shortly). It stems from the widely attested Proto-Indo-European root "hews-", which means dawn or east, from which also comes the name Eos (of the deified rosy-fingered Dawn) and the Latin ausum, hence English words like austral (literally: toward the dawn but used in the curious sense of from the south), and names like Australia (southland), and Austria (eastern land or land of dawn), and aurum, meaning gold, and hence the familiar words aura, aureole and auriferous. Another word for dawn is αυγη (auge), which emphasizes the rising of the sun and the increasing of the light; hence the name Augustus.
The link between gold and dawn possibly comes with the similarity in color of gold and the morning sun, but more likely because gold represents wisdom and thus light — see our articles on שחר (shahar), meaning dawn (as used in Isaiah 8:20: they have no "dawn"), and χρυσος (chrusos), meaning gold. The red-glowing (rosy-fingered, from ροδον, rhodon, rose, see the name Rhoda) of the horizon before the release of bright yellow light was (probably) referred to as μωρος (moros), literally dim-witted, from which comes the ever handy word moron. Redness in turn relates to χαλκος (chalkos), bronze.
Our adverb αυριον (aurion), dawn or "at the beginning of enlightenment", is used 15 times; see full concordance. From it derives: