fundamental unit

noun Physics.
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fundamental unit
 
n
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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Example sentences
Personal relationships are the fundamental unit of our society.
Personal relationships are the fundamental unit of our society.
The former is the fundamental unit of electrochemical storage and discharge.
Proposals should focus on organisms as a fundamental unit of biological
  organization.
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