This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The quality of being convertible

n. The quality of a currency of being exchangeable for gold or other currencies

n. The condition or quality of being convertible; capability of being exchanged; convertibleness.

n. The condition or quality of being convertible.

n. Capability of being applied or turned to a new use. The quality of being interchangeable: as, the convertibility of certain letters. In logic, capability of being transformed by conversion.

n. the quality of being exchangeable (especially the ability to convert a currency into gold or other currencies without restriction)

"Note that the element of convertibility is not a prerequisite; it is sufficient only to commit to the price of gold becoming the "alarm signal" for the real bills doctrine to work."

fungibility    interchangeableness    interchangeability    exchangeability   

convertibleness   

convert   

accessibility    advisability    availability    believability    collectibility    comparability    credibility    culpability    deniability    dependability   

indetermination    libration    providian    outness    overlordship    tergiversation    politesse    devaluations    frequentation    prime minister