apeiron
noun
apei·ron
əˈpīˌrän,
-pā-
plural apeira
-rə,
-ˌrä
: the unlimited, indeterminate, and indefinite ground, origin, or primal principle of all matter postulated especially by Anaximander
Word History
Etymology
Greek, from neuter of apeiros endless, infinite, from a- a- entry 2 + -peiron (from peirat-, peirar end, conclusion); akin to peri around