fundamental unit

noun

one of a set of unrelated units that form the basis of a system of units. For example, the metre, kilogram, and second are fundamental units of the SI system

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It had made the family the fundamental unit of the tribe, the clan, the race, the nation.

The fundamental unit of the metric system is the meter (the unit of length).

The solar day is the fundamental unit of time, not only in daily life but in astronomical practice.

It is not given to many men to know the ultimate essentials of all horror, concentrated into one fundamental unit.

The metric system is the system of measurement of which the meter is the fundamental unit.

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