heat

American  

[heet] / hit /

noun

• heat
  plural

1. a relatively high degree of warmth.

   Antonyms:

   coolness

2. the condition or quality of being hot.

   The heat of the oven will caramelize the natural sugars in the vegetables, enhancing their flavor.

   Synonyms:

   warmth, hotness

3. the degree of hotness; temperature.

   Heat is measured with a thermometer.

   Moderate heat is sufficient for a child’s bathwater.

   Synonyms:

   caloricity

4. the sensation of warmth or hotness.

   She enjoyed the pleasant heat on her face and hands from the crackling fire.

5. a bodily temperature higher than normal.

   The heat caused by physical exertion is reduced by sweating.

6. added or external energy that causes a rise in temperature, expansion, evaporation, or other physical change.

   The application of heat causes particles of matter to move more rapidly.

7. Physics. a nonmechanical energy transfer with reference to a temperature difference between a system and its surroundings or between two parts of the same system. Q

8. a hot condition of the atmosphere or physical environment; hot season or weather.

   They go up north in the summer to escape the heat.

9. a period of hot weather.

10. a sharp, pungent flavor, as that produced by strong spices.

11. warmth or intensity of feeling; vehemence; passion.

    He spoke with much heat and at great length.

    Synonyms:

    impetuosity, excitement, fever, flush, zeal, fervor, ardor

    Antonyms:

    indifference

12. a point or period of high intensity in an action, process, situation, etc..

    Soldiers must make snap decisions in the heat of battle with no certainty of the outcome.

    In the heat of his hasty departure he forgot his keys.

13. Often the heat pressure to act, work, etc..

    All this media attention is putting the heat on him to change his position on the issue.

    Give me a deadline—I work best under a little heat.

14. Slang. intensified pressure verging on coercion and involving intimidation or implied threat, especially in a police investigation.

    They had to use heat to get the guy to give them some names.

15. Slang. the heat, the police.

    We split when we saw the heat coming.

16. Slang. armed protection, especially a pistol, revolver, or other firearm.

    All guards carry some heat.

17. a single intense effort; a sustained, concentrated, and continuous operation.

    The painting was finished at a heat.

18. Sports.

    1. a single course in or division of a race or other contest.

    2. a race or other contest in which competitors attempt to qualify for entry in the final race or contest.

19. Metallurgy.

    1. a single operation of heating, as of metal in a furnace, in the treating and melting of metals.

    2. a quantity of metal produced by such an operation.

20. Zoology.

    1. sexual receptiveness in animals, especially females.

    2. the period or duration of such receptiveness.

       Do not frequent dog parks or other dog-populated areas while your dog is in heat.

21. Slang. the heat, awesome or excellent; cool.

    Check out the photography on her website—that stuff’s the heat!

---

verb (used with object)

• heats,
  present (3rd person singular)
• heated,
  past participle,  past
• heating
  present participle

1. to make hot or warm (often followed byup ).

   Let me heat this leftover soup in the microwave.

   Antonyms:

   cool

2. to excite emotionally; inflame or rouse with passion.

   Synonyms:

   animate, stir, warm, stimulate

verb (used without object)

• heats,
  present (3rd person singular)
• heated,
  past participle,  past
• heating
  present participle

1. to become hot or warm (often followed byup ).

   It takes a while for the house to heat up.

2. to become excited emotionally.

verb phrase

1. heat up to increase or become more active or intense.

   Business competition will heat up toward the end of the year.

heat British  

/ hiːt /

noun

1. 1. the energy transferred as a result of a difference in temperature

   2. the random kinetic energy of the atoms, molecules, or ions in a substance or body

2. the sensation caused in the body by heat energy; warmth

3. the state or quality of being hot

4. hot weather

   the heat of summer

5. intensity of feeling; passion

   the heat of rage

6. pressure

   the political heat on the government over the economy

7. the most intense or active part

   the heat of the battle

8. a period or condition of sexual excitement in female mammals that occurs at oestrus

9. sport

   1. a preliminary eliminating contest in a competition

   2. a single section of a contest

10. slang police activity after a crime

    the heat is off

11. slang criticism or abuse

    he took a lot of heat for that mistake

12. without pausing to think

13. 1. Also: in season.  (of some female mammals) sexually receptive

    2. in a state of sexual excitement

14. slang the police

15. informal to increase the intensity of activity, coercion, etc

---

verb

1. to make or become hot or warm

2. to make or become excited or intense

heat Scientific  

/ hēt /

1. Internal energy that is transferred to a physical system from outside the system because of a difference in temperature and does not result in work done by the system on its surroundings. Absorption of energy by a system as heat takes the form of increased kinetic energy of its molecules, thus resulting in an increase in temperature of the system. Heat is transferred from one system to another in the direction of higher to lower temperature.

2. See also thermodynamics See Note at temperature

3. See estrus

---

heat Cultural  

1. In physics, a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat. (See infrared radiation.)

---

heat Idioms  

More idioms and phrases containing heat

• dead heat
• in heat
• in the heat of the moment
• turn up the heat

---

Other Word Forms

Derived Forms

• reheat
  verb
• underheat
  verb (used with object)
• heatable
  adjective
• heatful
  adjective
• heatless
  adjective
• heatlike
  adjective
• reheatable
  adjective
• self-heating
  adjective
• unheatable
  adjective

Inflected Forms

Nouns

• heat
  plural

Participles

• heating
  present
• heated
  past

Conjugated Forms

Present

• heat
  simple
• heats
  simple
• have heated
  perfect
• has heated
  perfect
• am heating
  progressive
• are heating
  progressive
• is heating
  progressive
• have been heating
  perfect progressive
• has been heating
  perfect progressive

Past

• heated
  simple
• had heated
  perfect
• was heating
  progressive
• were heating
  progressive
• had been heating
  perfect progressive

Future

• will heat
  simple
• will have heated
  perfect
• will be heating
  progressive
• will have been heating
  perfect progressive

Etymology

Origin of heat

First recorded before 900; Middle English hete, Old English hǣtu; akin to German Hitze; see hot

Explanation

Objects that give off heat — or a feeling of warmth — include the sun, a radiator, and even your body. You can feel a marked difference in air temperature if you hold your hand near the heat of a candle flame, for example. Heat can also mean the intensity of an emotion. In the heat of an argument, you need to watch what you say, because you may regret it later. The verb heat means to make something hot, like when you heat up last night's pizza to eat for lunch today. When things heat up, they become exciting or intense, the way thrilling chase scenes heat up your favorite action movie.

Example Sentences

See Examples For:

heat heats heated heating

The 35-person board led by Casey Wasserman, who was recently under heat for his ties to Jeffrey Epstein and Ghislaine Maxwell, is meant to help plan and execute the upcoming Olympic Games.

From Los Angeles Times ● Sep. 20, 2026

While the evidence suggests things have to get pretty bad for a club to change manager early in the season, a few bosses are feeling the heat.

From BBC ● Sep. 20, 2026

The team successfully isolated the nitrogenase directly from the microorganism and found that it was unusually resistant to heat.

From Science Daily ● Sep. 19, 2026

He and his father prefer spicy food, but the rest of Avelar’s family can’t tolerate as much heat.

From The Wall Street Journal ● Sep. 17, 2026

Jason Nez exhaustedly watched the wet ground blue corn mixture heat to a boil on the stove.

From "Legendary Frybread Drive-In" by Cynthia Leitich Smith

Canada's retaliatory tariffs on billions of dollars in US products took effect Tuesday, as a trade war between the North American neighbors heats up.

From Barron's ● Sep. 8, 2026

When the Sun is more active, extra energy heats the atmosphere and makes its outer layers extend farther into space.

From Science Daily ● Sep. 1, 2026

Land heats up faster than the oceans, parts of Europe stretch into the rapidly warming Arctic, and changes in weather patterns have favoured more frequent and intense summer heatwaves.

From BBC ● Aug. 31, 2026

That’s because ocean water expands as it heats.

From Los Angeles Times ● Aug. 24, 2026

In all previous Olympic rowing competitions, he pointed out, preliminary heats as well as finals had been limited to four boats.

From "The Boys in the Boat: Nine Americans and Their Epic Quest for Gold at the 1936 Berlin Olympics" by Daniel James Brown

New heated debates are flaring up across the industry as CEOs, researchers and policymakers grapple with what it means to pace the frontier.

From MarketWatch ● Sep. 19, 2026

Despite the heated rhetoric, hope remains that the two global rivals can agree on something regarding the technology when the leaders meet in Washington.

From Barron's ● Sep. 17, 2026

Peat would be cut into blocks and left to dry; peat made a good, slow-burning fuel, and for generations it was what Manx households cooked on and heated their homes with.

From BBC ● Sep. 12, 2026

Mr. Baitz’s play is set during the Christmas season in Palm Springs, Calif., where the tensions at a family gathering grow more heated than the air outside when a long-buried family secret is revealed.

From The Wall Street Journal ● Sep. 9, 2026

He and Babulya had heated discussions about every individual letter, it seemed.

From Anya and the Dragon by Sofiya Pasternack

In the northeast, where many families warm their homes with heating oil, a close cousin to diesel, residents are now bracing for colder weather.

From The Wall Street Journal ● Sep. 18, 2026

Data from the NI consumer council suggests 500 litres of home heating oil currently costs around £560, more than twice the price compared to this time last year.

From BBC ● Sep. 16, 2026

Under some heating conditions, chlorine from sucralose may become incorporated into other compounds whose health effects remain uncertain.

From Science Daily ● Sep. 14, 2026

U.S. natural gas futures ended the week lower as the market entered the shoulder season where summer cooling demand tapers off before early-season heating demand starts to kick in.

From The Wall Street Journal ● Sep. 14, 2026

Think we’ve stopped bombing Italy since the Allied invasion last month, but now that Italy’s declared war on Germany, things are really heating up.

From "Code Name Verity" by Elizabeth Wein

Related Words

• bake
• boil
• broil
• grill
• ignite
• melt
• reheat
• roast
• sear
• steam
• thaw
• toast
• warm