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base unit

noun

, Physics.
  1. one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences.

base unit

noun

  1. physics any of the fundamental units in a system of measurement. The base SI units are the metre, kilogram, second, ampere, kelvin, candela, and mole

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tortuous

[tawr-choo-uhs ]

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