Definitions from Wiktionary (volatile)

▸ adjective:  (physics) Evaporating or vaporizing readily under normal conditions.
▸ adjective:  (of a substance, informal) Explosive.
▸ adjective:  (of a price etc) Variable or erratic.
▸ adjective:  (of a person) Quick to become angry or violent.
▸ adjective:  Fickle.
▸ adjective:  Temporary or ephemeral.
▸ adjective:  (of a situation) Potentially violent.
▸ adjective:  (programming, of a variable etc.) Having its associated memory immediately updated with any changes in value.
▸ adjective:  (computing, of memory) Whose content is lost when the computer is powered down.
▸ adjective:  (obsolete) Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly.
▸ noun:  A chemical or compound that changes into a gas easily.
▸ noun:  (programming) A variable that is volatile, i.e. has its associated memory immediately updated with any change in value.

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