Heat Definition

hēt

heated, heating, heats

noun

heats

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.

American Heritage

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.

Webster's New World

Much hotness; great warmth.

Stifling heat.

Webster's New World

Fever.

Webster's New World

An abnormally high bodily temperature, as from a fever.

American Heritage Medicine

Synonyms:

Antonyms:

verb

heated, heating, heats

To make warm or hot.

American Heritage

To excite the feelings of; inflame.

American Heritage

To increase the molecular or kinetic energy of (an object).

American Heritage

To make or become excited; inflame or become inflamed.

Webster's New World

To become warm or hot.

American Heritage

Synonyms:

Antonyms:

Antonyms:
cool
freeze
reduce the temperature

abbreviation

(military) High Explosive Anti-Tank — antitank munition using a high explosive shaped charge to breach armour.

Wiktionary

Origin of Heat

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”).

From Wiktionary
From Middle English heten, from Old English hǣtan (“to heat; become hot”), from Proto-Germanic *haitijaną (“to heat, make hot”).

From Wiktionary
Middle English hete from Old English hǣtu kai- in Indo-European roots

From American Heritage Dictionary of the English Language, 5th Edition