e⋅on / ˈi ən , ˈi ɒn / Show Spelled Pronunciation [ ee -uh n, ee -on] Show IPA –noun 1. an indefinitely long period of time; age.
2. the largest division of geologic time, comprising two or more eras.
3. Astronomy . one billion years.
ae·on (ē'ŏn', ē'ən) n. Variant of eon .
e·on also ae·on (ē'ŏn', ē'ən) n. An indefinitely long period of time; an age.
The longest division of geologic time, containing two or more eras.
[Late Latin aeōn , from Greek aiōn ; see aiw- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
eon (ē'ŏn') Pronunciation Key
The longest division of geologic time , containing two or more eras.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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