temperature - the degree of hotness or coldness of anything, usu. as measured on a thermometer; as - a) the degree of heat of a living body; b) an excess of this over the normal (about 98.60 F or 370 C in humans); fever; c) the degree of heat of the atmosphere; d) the degree of heat of anything.

that temperature above which a given gas cannot be liquefied, regardless of the pressure applied; critical temperature.