absolute zero absolute zero /ˈæbsəlut ˈzɪroʊ/

noun

1. (cryogenics) the lowest temperature theoretically attainable (at which the kinetic energy of atoms and molecules is minimal); 0 Kelvin or -273.15 centigrade or -459.67 Fahrenheit  ( absolute zero )
   (cryogenics) the lowest temperature theoretically attainable (at which the kinetic energy of atoms and molecules is minimal); 0 Kelvin or -273.15 centigrade or -459.67 Fahrenheit
    Scientists have never achieved absolute zero, as it remains a theoretical limit.
   Scientists have never achieved absolute zero, as it remains a theoretical limit.