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Define temperature. temperature synonyms, temperature pronunciation, temperature translation, English dictionary definition of temperature. n. 1. a. The degree of hotness or coldness of a body or environment. b. A measure of the average kinetic energy of the particles in a sample of matter,...
Wiktionary (0.00 / 0 votes) Rate this definition: degree day (Noun). A measure of heating or cooling, computed as the integral of a function of time that generally varies with temperature.iktionary (0.00 / 0 votes) Rate this definition: degree day (Noun). A measure of heating or cooling, computed as the integral of a function of time that generally varies with temperature.