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deep time Syllabification: deep time

Entry from US English dictionary

Definition of deep time in English:

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 fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
adverb
(especially as a direction) very loud or loudly