- (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3).
- 1 : an immeasurably or indefinitely long period of time. I haven’t seen him in eons.
- 2a : a very large division of geologic time usually longer than an era. The Archean eon
- b : a unit of geologic time equal to one billion years
A penny for your thoughts,
a pound for mine.
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