from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A form of energy associated with the motion of atoms or molecules and capable of being transmitted through solid and fluid media by conduction, through fluid media by convection, and through empty space by radiation.
  • n. The transfer of energy from one body to another as a result of a difference in temperature or a change in phase.
  • n. Physics The sensation or perception of such energy as warmth or hotness.
  • n. Physics An abnormally high bodily temperature, as from a fever.
  • n. The condition of being hot.
  • n. A degree of warmth or hotness: The burner was on low heat.
  • n. The warming of a room or building by a furnace or another source of energy: The house was cheap to rent, but the heat was expensive.
  • n. A furnace or other source of warmth in a room or building: The heat was on when we returned from work.
  • n. Physics A hot season; a spell of hot weather.
  • n. Intensity, as of passion, emotion, color, appearance, or effect.
  • n. The most intense or active stage: the heat of battle.
  • n. A burning sensation in the mouth produced by spicy flavoring in food.
  • n. Physics Estrus.
  • n. Physics One of a series of efforts or attempts.
  • n. Sports & Games One round of several in a competition, such as a race.
  • n. A preliminary contest held to determine finalists.
  • n. Informal Physics Pressure; stress.
  • n. Slang An intensification of police activity in pursuing criminals.
  • n. Slang The police. Used with the.
  • n. Slang Physics Adverse comments or hostile criticism: Heat from the press forced the senator to resign.
  • n. Slang Physics A firearm, especially a pistol.
  • transitive v. To make warm or hot.
  • transitive v. To excite the feelings of; inflame.
  • transitive v. To increase the molecular or kinetic energy of (an object).
  • intransitive v. To become warm or hot.
  • intransitive v. To become excited emotionally or intellectually.
  • heat up Informal To become acute or intense: "If inflation heats up, interest rates could increase” ( Christian Science Monitor).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Thermal energy.
  • n. The condition or quality of being hot.
  • n. An attribute of a spice that causes a burning sensation in the mouth.
  • n. A period of intensity, particularly of emotion.
  • n. An undesirable amount of attention.
  • n. The police.
  • n. One or more firearms.
  • n. A fastball.
  • n. A condition where a mammal is aroused sexually or where it is especially fertile and therefore eager to mate.
  • n. A preliminary race, used to determine the participants in a final race
  • n. One cycle of bringing metal to maximum temperature and working it until it is too cool to work further
  • n. A hot spell.
  • n. Heating system.
  • n. The output of a heating system.
  • v. To cause an increase in temperature of an object or space; to cause something to become hot; often with "up".
  • v. To arouse, to excite (sexually).

from the GNU version of the Collaborative International Dictionary of English

  • Heated.
  • n. A force in nature which is recognized in various effects, but especially in the phenomena of fusion and evaporation, and which, as manifested in fire, the sun's rays, mechanical action, chemical combination, etc., becomes directly known to us through the sense of feeling. In its nature heat is a mode of motion, being in general a form of molecular disturbance or vibration. It was formerly supposed to be a subtile, imponderable fluid, to which was given the name caloric.
  • n. The sensation caused by the force or influence of heat when excessive, or above that which is normal to the human body; the bodily feeling experienced on exposure to fire, the sun's rays, etc.; the reverse of cold.
  • n. High temperature, as distinguished from low temperature, or cold
  • n. Indication of high temperature; appearance, condition, or color of a body, as indicating its temperature; redness; high color; flush; degree of temperature to which something is heated, as indicated by appearance, condition, or otherwise.
  • n. A single complete operation of heating, as at a forge or in a furnace.
  • n. A violent action unintermitted; a single effort; a single course in a race that consists of two or more courses.
  • n. Utmost violence; rage; vehemence.
  • n. Agitation of mind; inflammation or excitement; exasperation.
  • n. Animation, as in discourse; ardor; fervency.
  • n. Sexual excitement in animals; readiness for sexual activity; estrus or rut.
  • n. Fermentation.
  • n. Strong psychological pressure, as in a police investigation.
  • intransitive v. To grow warm or hot by the action of fire or friction, etc., or the communication of heat.
  • intransitive v. To grow warm or hot by fermentation, or the development of heat by chemical action.
  • transitive v. To make hot; to communicate heat to, or cause to grow warm.
  • transitive v. To excite or make hot by action or emotion; to make feverish.
  • transitive v. To excite ardor in; to rouse to action; to excite to excess; to inflame, as the passions.

from The Century Dictionary and Cyclopedia

  • To cause to grow warm; communicate heat to; make hot: as, to heat an oven or a furnace; to heat iron. See heat, n., 2.
  • To make feverish; stimulate; excite: as, to heat the blood.
  • To warm with emotion, passion, or desire; rouse into action; animate; encourage.
  • To run a heat over, as in a race.
  • To grow warm or hot; come to a heated condition, from the effect either of something external or of chemical action, as in fermentation or decomposition.
  • n. A sensation of the kind produced by close proximity to fire.
  • n. That condition of a material body which is capable of producing the sensation of heat; in physics, the corresponding specific form of energy, consisting in an agitation of the molecules of matter, and measured by the total kinetic energy of such agitation. See energy, 7.
  • n. In ordinary use, a sensibly high temperature, as the warmth of the sun, or of the body.
  • n. A heating, as of a piece of iron to be wrought by a blacksmith, or of a mass of metal to be melted in a furnace; an exposure to intense heat.
  • n. Hence Violent action; high activity; intense and uninterrupted effort: as, to do a thing at a heat.
  • n. Especially— A single course in a horse-race or other contest.
  • n. A division of a race or contest when the contestants are too numerous to run at once, the race being finally decided by the winners (or winners and seconds) of each division running a final race or heat.
  • n. Indication of high temperature, as the condition or color of the body or part of the body; redness; high color.; flush.
  • n. Vehemence; rage; violence; excitement; animation; fervency; ardor; zeal: as, the heat of battle or of argument; the heat of passion or of eloquence.
  • n. Sexual desire or excitement in animals, especially in the female, corresponding to rut in the male; the period or duration of such excitement: as, to be in heat.
  • n. The quantity or weight of metal undergoing a metallurgical process. See heat. 4.
  • n. In electricity, that portion of the heat developed in an electric circuit which cannot be converted directly into electrie energy. The total heat in an electric circuit is HJ= IRt + PIt, where H is the heat in calories, J is the mechanical equivalent, I the current, R the resistance, t the time during which the current flows, and P is the difference of potential due to the heating of any metal junctions that may exist in the circuit. The term IRt represents the irreversible heat. Also called ohmic heat. Compare reversible heat.
  • n. The heat in calories required to convert a gram of liquid at its melting-point into saturated vapor at a given pressure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the sensation caused by heat energy
  • n. applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
  • v. arouse or excite feelings and passions
  • v. gain heat or get hot
  • v. make hot or hotter
  • n. the trait of being intensely emotional
  • v. provide with heat
  • n. the presence of heat
  • n. a form of energy that is transferred by a difference in temperature
  • n. utility to warm a building
  • n. a preliminary race in which the winner advances to a more important race


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English hete, from Old English hǣtu; see kai- in Indo-European roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Old English hæte.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Old English hætan


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