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Indivisible

1. Not divisible; incapable of being divided, separated, or broken; not separable into parts. One indivisible point of time.

2. (Science: mathematics) Not capable of exact division, as one quantity by another; incommensurable.

Origin: L. Indivisibilis: cf. F. Indivisible. See in- not, and Divisible.

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. (Science: geometry) 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.