adjective.
Not divisible; incapable of being divided, separated, or broken; not separable into parts.
adjective.
Not capable of exact division, as one quantity by another; incommensurable.
noun.
That which is indivisible.
noun.
An infinitely small quantity which is assumed to admit of no further division.
noun.
a kind of calculus, formerly in use, in which lines were considered as made up of an infinite number of points; surfaces, as made up of an infinite number of lines; and volumes, as made up of an infinite number of surfaces.