1. An absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics. (wikipedia.org)
2. A scale for measuring temperature, with zero defined as absolute zero, with kelvins as the units (equivalent to degrees Celsius). (wiktionary.org)
3. A temperature scale that defines absolute zero as 0 degrees; water freezes at 273.16 degrees and boils at 373.16 degrees. (biology-online.org)