Base unit of measurement

In the language of measurement, 'dimensions' are measurable attributes of reality such as 'time', 'distance', 'velocity', 'mass', 'weight', and so on.

Fundamental dimensions are those that are thought to be irreducible to others. Velocity, for example, is length divided by time, and so is derivative rather than fundamental.

Traditionally, the accepted fundamental dimensions are mass, length, time, and temperature.

see SI

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