\In`di*vis"i*ble\, a. [L. indivisibilis: cf. F.
indivisible. See {In-} not, and {Divisible}.]
1. Not divisible; incapable of being divided, separated, or
   broken; not separable into parts. ``One indivisible point
   of time.'' --Dryden.
2. (Math.) Not capable of exact division, as one quantity by
   another; incommensurable.

\In`di*vis"i*ble\, n.
1. That which is indivisible.
         By atom, nobody will imagine we intend to express a
         perfect indivisible, but only the least sort of
         natural bodies.                       --Digby.
2. (Geom.) 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.