This meaning refers to the physical sensation of warmth or the degree of hotness of an object or an environment. It can also relate to the energy produced by a source of heat.

This usage pertains to a rise in body temperature, often indicating illness. It is commonly used in medical contexts or when discussing someone's health.

Here, the term expresses intense emotions or fervor about a particular interest, hobby, or cause. It can convey both positive enthusiasm as well as negative intensity such as anger.