CONVERTIBILITY
convertibility
(noun) the quality of being exchangeable (especially the ability to convert a currency into gold or other currencies without restriction)
Source: WordNet® 3.1
Noun
convertibility (uncountable)
The quality of being convertible
The quality of a currency of being exchangeable for gold or other currencies
Source: Wiktionary
Con*vert`i*bil"i*ty, n.
Definition: The condition or quality of being convertible; capability of
being exchanged; convertibleness.
The mutual convertibility of land into money, and of money into land.
Burke.
Source: Webster’s Unabridged Dictionary 1913 Edition