'Lower' in the Bible

And the stone floor was by the side of the doorways, and was as wide as the doorways were long, even the lower floor.

Then he took the measure of the square across, from before the lower doorway inside to before the inner doorway outside, one hundred cubits. And he took me in the direction of the north,

And the higher rooms were shorter: for the covered ways took up more space from these than from the lower and middle rooms.

And from the base on the earth level to the lower shelf, the altar is two cubits high and a cubit wide; and from the smaller shelf to the greater shelf it is four cubits high and a cubit wide.