- The definition of heat is a form of energy that causes a difference in temperature, or the perception of warmth.
An example of heat is hot water.
- Heat is defined as to add warmth to something.
An example of heat is bringing a kettle of water to a boil.
The heat from this cup of hot water produces steam.
- the quality of being hot; hotness: in physics, heat is considered a form of energy existing as the result of the random motion of molecules and is the form of energy that is transferred between bodies as a result of their temperature difference
- much hotness; great warmth: stifling heat
- degree of hotness or warmth: at low heat
- the perception of heat by the senses, resulting from contact with or nearness to something hot; sensation of hotness or warmth felt through the skin
- hot weather or climate
- the warming of a room, house, etc., as by a stove or furnace: his rent includes heat
- a burning sensation produced by spices, mustard, etc.
- color or other appearance as an indication of hotness: blue heat in metals
- strong feeling or emotion; excitement, ardor, anger, zeal, etc.
- the period or condition of excitement, intensity, stress, etc.; most violent or intense point or stage: in the heat of battle
- a single effort, round, bout, or trial; esp., any of the preliminary rounds of a race, etc., the winners of which compete in the final round
- sexual excitement
- the period of sexual excitement in animals; esp., the estrus of females
- ☆ Slang
- coercion, as by intimidation
- great pressure, as in criminal investigation or law enforcement
- the police
- a pistol
- Baseball, Slang pitches thrown with great velocity
- a single heating of metal, ore, etc. in a furnace or forge
- the amount processed in a single heating
Origin of heatMiddle English hete ; from Old English hætu ; from base of hat (see hot), akin to German heiss ; from Indo-European base an unverified form kai-, heat
- to make or become warm or hot
- to make or become excited; inflame or become inflamed
- Physics a. 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.b. The transfer of energy from one body to another as a result of a difference in temperature or a change in phase.
- The sensation or perception of such energy as warmth or hotness.
- An abnormally high bodily temperature, as from a fever.
- a. The condition of being hot.b. A degree of warmth or hotness: The burner was on low heat.
- a. 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.b. A furnace or other source of warmth in a room or building: The heat was on when we returned from work.
- A hot season; a spell of hot weather.
- a. Intensity, as of passion, emotion, color, appearance, or effect.b. The most intense or active stage: the heat of battle.c. A burning sensation in the mouth produced by spicy flavoring in food.
- One of a series of efforts or attempts.
- a. Sports & Games One round of several in a competition, such as a race.b. A preliminary contest held to determine finalists.
- Informal Pressure; stress.
- Slang a. An intensification of police activity in pursuing criminals.b. The police. Used with the.
- Slang Adverse comments or hostile criticism: Heat from the press forced the senator to resign.
- Slang A firearm, especially a pistol.
verbheat·ed, heat·ing, heats
- To make warm or hot.
- To excite the feelings of; inflame.
- Physics To increase the molecular or kinetic energy of (an object).
- To become warm or hot.
- To become excited emotionally or intellectually.
Origin of heatMiddle English hete, from Old English h&aemac;tu; see kai- in Indo-European roots.
(countable and uncountable, plural heats)
- (uncountable) Thermal energy.
- This furnace puts out 5000 BTUs of heat. That engine is really throwing off some heat. Removal of heat from the liquid caused it to turn into a solid.
- (uncountable) The condition or quality of being hot.
- Stay out of the heat of the sun!
- (uncountable) An attribute of a spice that causes a burning sensation in the mouth.
- The chili sauce gave the dish heat.
- (uncountable) A period of intensity, particularly of emotion.
- It's easy to make bad decisions in the heat of the moment.
- (uncountable) An undesirable amount of attention.
- The heat from her family after her DUI arrest was unbearable.
- (uncountable, slang) The police.
- The heat! Scram!
- (uncountable, slang) One or more firearms.
- (countable, baseball) A fastball.
- The catcher called for the heat, high and tight.
- (uncountable) A condition where a mammal is aroused sexually or where it is especially fertile and therefore eager to mate.
- The male canines were attracted by the female in heat.
- (countable) A preliminary race, used to determine the participants in a final race
- The runner had high hopes, but was out of contention after the first heat.
- (countable) One cycle of bringing metal to maximum temperature and working it until it is too cool to work further.
- I can make a scroll like that in a single heat.
- (countable) A hot spell.
- The children stayed indoors during this year's summer heat.
- (uncountable) Heating system.
- I'm freezing, could you turn on the heat?
- (uncountable) The output of a heating system.
- During the power outage we had no heat because the controls are electric. Older folks like more heat than the young.
From Middle English hete, from Old English hǣte, hǣtu (“heat, warmth; fervor, ardor”), from Proto-Germanic *haitį̄ (“heat”), from Proto-Indo-European *kÀit- (“heat; hot”). Cognate with Scots hete (“heat”), North Frisian hiet (“heat”), Old High German heizī (“heat”). Related also to Dutch hitte (“heat”), German Hitze (“heat”), Swedish hetta (“heat”), Icelandic hita (“heat”).
(third-person singular simple present heats, present participle heating, simple past and past participle heated)
- To cause an increase in temperature of an object or space; to cause something to become hot; often with "up".
- I'll heat up the water.
- To excite or make hot by action or emotion; to make feverish.
- To excite ardour in; to rouse to action; to excite to excess; to inflame, as the passions.
- To arouse, to excite (sexually).
- The massage heated her up.
From Middle English heten, from Old English hǣtan (“to heat; become hot”), from Proto-Germanic *haitijaną (“to heat, make hot”).