n.
1.the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago)
Idiom of the Day
to a fault
to do something so very well or to be something so good that it is almost bad
My friend is honest to a fault and will not say anything unless it is the absolute truth.