fundamental unit - meaning and definition. What is fundamental unit
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What (who) is fundamental unit - definition

UNIT OF MEASUREMENT ADOPTED BY CONVENTION FOR A BASE QUANTITY
Fundamental dimensions/Forum; Fundamental units; Fundamental quantity; Base units; Fundamental dimensions; Fundamental Dimensions; Fundamental unit

fundamental unit         
¦ noun each of a set of unrelated units of measurement from which other units are derived, for example (in the SI system) the metre, kilogram, and second.
Base unit (measurement)         
A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others.
Fundamental unit (number theory)         
GENERATOR FOR THE UNIT GROUP OF THE RING OF INTEGERS OF A NUMBER FIELD
In algebraic number theory, a fundamental unit is a generator (modulo the roots of unity) for the unit group of the ring of integers of a number field, when that group has rank 1 (i.e.

Wikipedia

Base unit (measurement)

A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others. The SI base units, or Systeme International d'unites, consists of the metre, kilogram, second, ampere, kelvin, mole and candela.

A base unit is one that has been explicitly so designated; a secondary unit for the same quantity is a derived unit. For example, when used with the International System of Units, the gram is a derived unit, not a base unit.