apeiros (ap'·i·ros) [Gk -peirar, -peras] adj. The boundless, infinite; frontierless expansion. Used by Anaximander and Anaximenes, and by Plato in Philebus; the equivalent term apeiria was used by Anaxagors and Aristotle. Corresponds to 'eyn soph, and according to Porphyry to the Pythagorean monad (one), the "cause of all unity and measure of all things."

Created in the year 2000 by Jon Reid, Apeiros is a software consulting company that specializes software usability and the creation of user interfaces.