How do you spell Indivisible

Available Definitions:
1)  a. - Not divisible; incapable of being divided, separated, or broken; not separable into parts.
2)  a. - Not capable of exact division, as one quantity by another; incommensurable.
3)  n. - That which is indivisible.
4)  n. - An infinitely small quantity which is assumed to admit of no further division.