n. In Aboriginal mythology, the time in which the earth received its present form and in which the patterns and cycles of life were initiated.
Which just about covers it, but the expression can take on wider or narrower meanings, depending on who is using it. Many of the legends and stories that could have been associated with it have died out as the old people who knew them have gone.
Much of the remainder has as much political importance as it has cultural importance - and it is probably politically incorrect for me to say so.