If you sit down to dinner hanging your head and moaning that it's been an eon since you ate anything, you’re exaggerating. Millions of people get their gas & electricity from E.ON, one of the UK’s top energy companies. An eon is a really, really, super-long, impossible-to-measure length of time. Eon definition is - an immeasurably or indefinitely long period of time : age. See more. Eon, Long span of geologic time. As result of mergers, E.ON inherited the subsidiaries of VEBA, VIAG and Ruhrgas in Central and Eastern Europe. E.ON is one of the major public utility companies in Europe and the world's largest investor-owned energy service provider. Less Watch any video on demand content on one device - pause it, and continue watching where you left off on any other device. Eon, a variation of aeon, is defined as a unit of geological time equal to a billion years, or a very long period of time. Three eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon. E.ON is present in most of Scandinavia. Eon definition, an indefinitely long period of time; age. EON gives you the possibility to watch content up to 7 days after it has been broadcasted. Four hours ago is not an eon. How to use eon in a sentence. About e.on. An example of an eon is the unit of measure used when talking about how long ago the solar system was created. Continue Watching. Video on Demand. Enjoy more than … In formal usage, eons are the longest portions of geologic time (eras are the second-longest).