(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.

To encounter an uncomfortable situation.

(informal) To take the blame; to be the focus of anger or scrutiny; to take the consequences.

Heating of rooms within buildings.

(physics) the heat that is released or absorbed accompanying a change of state or of phase

A shimmering atmospheric disturbance caused by currents of warm air between the observer and the object observed.

(physics) The state of a thermodynamic system having reached a maximum entropy; temperature is uniform throughout, and no energy is available to do work.

(thermodynamics) Any device which converts heat energy into mechanical work, by moving heat from a source to a sink.

(physics) The capability of a system to absorb heat energy; the amount of thermal energy required to raise the temperature of a system by one temperature unit without any change of phase.