indivisible

adj

1. (not-comparable)Incapable of being divided; atomic.

   “one indivisible point of time”

   “Although the mainland and Taiwan are yet to be reunited, they belong to one and same China, which is an indivisible whole.”

2. (not-comparable)Incapable of being divided by a specific integer without leaving a remainder.

noun

1. That which cannot be divided or split.

   “By atom, nobody will imagine we intend to express a perfect indivisible, but only the least sort of natural bodies.”

   “The compoſition of Bodies, whether it be of Diviſibles or Indiviſibles, is a queſtion which must be rank'd with the Indiſſolvibles: For though it hath been attempted by the moſt illuſtrious Wits of all Philoſophick Ages; yet they have done little elſe, but ſhewn their own diviſions to be almoſt as infinite, as ſome ſuppoſe thoſe of their Subject.”

2. An infinitely small quantity which is assumed to admit of no further division.