(chiefly British also aeon)
- 1An indefinite and very long period of time, often a period exaggerated for humorous or rhetorical effect: he reached the crag eons before I arrived his eyes searched her face for what seemed like eonsMore example sentences
- It is deep time that makes possible the blind movement of evolution, the massing and honing of minute effects over eons.
- And unlike a lot of rock on Earth that has been unrecognizably recycled by volcanic activity over the eons, a lot of lunar material retains records of some of the first impacts.
- Consequently, in his view, for eons philosophers have in essence been barking up the wrong tree.
- 1.1 Astronomy & Geology A unit of time equal to a billion years.More example sentences
- This mass of molten continent still, however, retains enough homogeneity to be returned more or less as a unit at the mid-ocean ridges eons later as the rock cycle continues.
- It's possible: Astronomers believe that comets and asteroids hitting the Moon eons ago left some water behind.
- 1.2 Geology A major division of geological time, subdivided into eras: the Precambrian eonMore example sentences
- Despite our lack of knowledge, or perhaps because of it, researchers have divided the Precambrian into three time periods called eons.
- The record has been much deformed, reconstituted, and obliterated during the subsequent Proterozoic and Phanerozoic eons.
- Originally there were only two eons, the Precambrian and the Phanerozoic.
mid 17th century: via ecclesiastical Latin from Greek aiōn 'age'.
More definitions of eonDefinition of eon in:
- The British & World English dictionary