a form of energy that is transferred by a difference in temperature
"The hot cup of coffee slowly transferred heat to the cold spoon resting on its saucer until they reached the same temperature."
the presence of heat
"The intense heat from the oven made it hard to stand near the counter while I was baking cookies."
a preliminary race in which the winner advances to a more important race
"After three grueling heats, the fastest swimmer finally qualified for the finals."
utility to warm a building
"the heating system wasn't working"
"they have radiant heating"
Thermal energy.
"The tank commander ordered his crew to deploy heat rounds against the enemy's heavily armored vehicles during the night raid."
Acronym of high explosive antitank: a munition using a high explosive shaped charge to breach armour.
In plain English: Heat is the energy that makes things feel warm or hot to the touch.
"The heat from the sun made the pavement feel too warm to walk on."
Usage: As a noun, heat refers to thermal energy that makes things warm or causes them to burn. It is unrelated to the military acronym for high explosive antitank munitions.
To cause an increase in temperature of (an object or space); to cause to become hot (often with "up").
"The sun beat down on the asphalt until it had completely heated up."
In plain English: To heat something means to make it warmer by adding energy to it.
"Please heat up the soup before we eat dinner."
Usage: Use heat as a verb when you cause something to become physically warmer, such as heating up food or the air conditioning. It often appears with the particle "up" to indicate raising the temperature significantly.
The word "heat" comes from the Old English hǣtu, which traces its roots back to a Proto-Indo-European root meaning "to heat or be hot." It entered modern English through Middle English with essentially the same original sense of thermal energy.