1.NounIn the International System of Units, the base unit of thermodynamic temperature; ⁄273.16 of the thermodynamic temperature of the triple point of water.
"Ice melts above 273.15 kelvins.; Water boils above 373.15 kelvins."
2.NounOne degree of difference on this scale, as a unit interval.
"The dew point here today is only 1 kelvin above what it was yesterday.; The interval between the freezing and boiling points of water is 100 kelvins."
3.NounA measurement of color warmth defined by the temperature kelvin at which an incandescent blackbody would emit a given color.