Indivisible \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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Indivisible \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.

Source: Webster's Revised Unabridged Dictionary (1913)