SI system

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Definition
  1. Proper noun:
    • The International System of Units: The "SI system" is the modern, globally accepted form of the metric system. It is a coherent system of measurement units based on seven defining constants, from which all other units are derived.
Usage
  • The term "SI system" is used in scientific, technical, and educational contexts to refer to the standard system of measurement.
  • It is often used to contrast with older metric systems or non-metric systems like the Imperial system.
  • "SI" is an abbreviation for the French "Système International d'Unités."
Examples
  • Proper noun:
    • All measurements in the physics experiment were recorded using the SI system.
    • The textbook explains how to convert Imperial units to the SI system.
    • The SI system defines the second, meter, and kilogram as base units.
Advanced Usage
  • "Adopt the SI system": To formally start using the International System of Units as a standard.
    • The country's industry decided to fully adopt the SI system for trade.
  • "SI units": The specific measurement units within the SI system (e.g., meter, kilogram, second).
    • Force is expressed in newtons, which are derived SI units.
Variants and Related Words
  • Metric system (n): A decimal-based system of measurement. The SI system is the modern, standardized version of the metric system.
    • While related, the metric system is a broader term, and the SI system is its specific, internationally agreed-upon form.
  • Système International d'Unités (n): The full, original French name for the SI system.
Synonyms
  • International System of Units: The formal, full name of the SI system.
  • Modern metric system: A descriptive synonym emphasizing it is the current standard.
Notes on Meaning
  • The core meaning of "SI system" is the complete, coherent framework for measurement. Its defining feature is its set of seven base units: the meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity).
Noun
  1. a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)
    • Today the United States is the only country in the world not totally committed to the Systeme International d'Unites

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