Definition of "volatile"

(physics) Evaporating or vaporizing readily under normal conditions.  examples

(of a substance, informal) Explosive.  examples

(of a price etc) Variable or erratic.  examples

(of a person) Quick to become angry or violent.  examples

Fickle.  examples

Temporary or ephemeral.  examples

(of a situation) Potentially violent.  examples

(programming, of a variable etc.) Having its associated memory immediately updated with any changes in value.  quotations  examples

(computing, of memory) Whose content is lost when the computer is powered down.  examples

(obsolete) Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly.

A chemical or compound that changes into a gas easily.  examples

(programming) A variable that is volatile, i.e. has its associated memory immediately updated with any change in value.  quotations  examples