1. Things that cannot be divided or separated into parts; entities that must remain whole.
Usage: Usually plural; often used in philosophical or mathematical contexts
2. In mathematics and philosophy, infinitesimal or atomic units that cannot be further subdivided.
Usage: technical; historical—associated with 17th-century mathematical theory

Examples

• Some philosophers argue that consciousness is one of the indivisibles of human experience.
• In early calculus, mathematicians debated whether indivisibles could explain the area under a curve.
• The nation's founders believed certain rights were indivisibles that could not be taken away.
• The team treated their unity as one of the indivisibles necessary for success.
• Medieval scholars discussed whether atoms were true indivisibles or merely very small particles.