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Webster 1913 Edition

Noun.

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.

Noun.

[from convertible.]

The quality of being possible to be converted or changed from one substance, form or state to another; as the convertibility of land into money.

The quality of being changeable from one letter to another; as the convertibility of m with b or of d into t.

convertibility ‎(uncountable)