Definition of deep time in English:

deep time

Syllabification: deep time

Entry from US English dictionary

noun

Geology
The multimillion year time frame within which scientists believe the earth has existed, and which is supported by the observation of natural, mostly geological, phenomena.

Definition of deep time in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something