Webster 1913 Edition
Not divisible; incapable of being divided, separated, or broken; not separable into parts.“One indivisible point of time.”
Not capable of exact division, as one quantity by another; incommensurable.
That which is indivisible.
By atom, nobody will imagine we intend to express a perfect
indivisible, but only the least sort of natural bodies.
An infinitely small quantity which is assumed to admit of no further division.
Method of indivisibles,
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.
Webster 1828 Edition
That cannot be divided, separated or broken; not separable into parts. Perhaps the particles of matter, however small, cannot be considered as indivisible. The mind or soul must be indivisible. A mathematical point is indivisible.