(1) The tendency of an organism or a cell to regulate its internal conditions, usually by a system of feedback controls, so as to stabilize health and functioning, regardless of the outside changing conditions
(2) The ability of the body or a cell to seek and maintain a condition of equilibrium or stability within its internal environment when dealing with external changes
Homeostatic equilibrium is the tendency of an organism or a cell to regulate the internal conditions. It may also pertain to the ability or a property of a biological system to seek and maintain a condition where there is equilibrium or stability within the internal environment in spite of the changes in the external environment. It usually is driven by a system of feedback controls that stabilize or normalize the physiological capacity of the organism. Homeostasis is a state of the body or a cell where there is stability within its internal environment. It is involved in the maintenance of the constant internal environment which includes the function of kidney, liver, skin, etc.
In humans, homeostasis happens when the body regulates body temperature in an effort to maintain an internal temperature around 98.6 degrees Fahrenheit. For example, we sweat to cool off during the hot summer days, and we shiver to produce heat during the cold winter season.