SIdefined
SIdefined is a hypothetical concept or system that would refer to a predefined or established set of standards and units related to the International System of Units (SI). The SI is the modern form of the metric system and the world's most widely used system of measurement. It is a coherent system of units that is based on seven base units: the meter, kilogram, second, ampere, kelvin, mole, and candela.
A "SIdefined" system, if it were to exist as a distinct entity, would likely imply a formalized