Archaic spelling of heat.

(military) Acronym of high explosive antitank: a munition using a high explosive shaped charge to breach armour.

(rare) Hot.

A situation has reached a point of great commotion, energy, or activity.

Third-person singular simple present indicative form of heat

plural of heat (countable senses)

(plural noun, dated) A period of hot weather.

plural of heating

(idiomatic) A period of exceptionally hot weather. / (US, weather broadcasting) Three consecutive days with daytime high temperature of 90 degrees Fahrenheit or higher.

The heating of something at constant pressure.