temperature UK /ˈtɛm.p(ə.)ɹə.t͡ʃə/US /ˈtɛm.pɚ.(ə)ˌt͡ʃɚ/noun 7forms 1phrases 2 noun7 •a number that tells how warm or cool something or someone isThe boiling temperature of pure water is 100 degrees Celsius.The temperature in the room dropped nearly 20 degrees; it went from hot to cold. •An elevated body temperature, as present in many illnesses; fever.You have a temperature. I think you should stay home today. You’re sick. •A property of macroscopic amounts of matter that serves to gauge the average intensity of the random actual motions of the individually mobile particulate constituents. •(figurative) The general mood.[Stephen] Miller's words did not seem designed to lower the temperature. — 2025 •A parameter that controls the degree of randomness of the output. •(no longer used) The balance of humours in the body, or one's character or outlook as considered determined from this; temperament.Our intemperence it is that pulls so many several incurable diseases on our heads, that hastens old age, perverts our temperature, and brings upon us sudden death. — 1624 •(no longer used) The state or condition of being tempered or moderated. formstemperatures Phrases with temperature assume room temperatureTo die; to be killed. run a temperatureTo have a fever.