Physics.
one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences. Also called fundamental unit .
Physics.
one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences. Also called fundamental unit .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012