the period of time from about 2.5 million years ago to the present, in which modern humans appeared:
Quaternary
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Later than, or subsequent to, the Tertiary;
Post-tertiary; as, the Quaternary age, or Age of man.
Quaternary meaning & definition 1 of Quaternary.
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[Quaternary] refers to the fourth of/in class. [It follows] primary, secondary, and [tertiary].
Quaternary meaning & definition 2 of Quaternary.
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[A knee] jerk response from [corporate] to increase profits and [decrease] cost.
Quaternary meaning & definition 3 of Quaternary.
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Quaternary meaning & definition 4 of Quaternary.
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