http://www.blueletterbible.org/lang/...gs=H3117&t=KJV
There you go, my young theology student, there is a direct link to the specific Hebrew word defining that to be day, time, year, lifetime, always, continually, and so on; all reused in the Bible itself as those alternate words in today's translations.
It's kinda crazy, but zomg! Faith in God and creation as *directly transcribed* from the Bible, does not actually contradict scientific findings of an Old Earth! Who'd a thunk it!