What does fungible mean?
Fungible describes goods, assets, or units that are mutually interchangeable because each one is identical in kind and value to every other. A barrel of crude oil of a given grade, an ounce of gold, a share of stock, or a dollar bill is fungible: if you lend one and receive an equivalent back, you are made whole, even if it is not the very same item. The concept matters most in finance, commerce, and law, where contracts and obligations often turn on whether something can be replaced by an equivalent or must be returned in specie. The adjective carries a neutral, technical tone and appears chiefly in professional writing, though it became widely known through 'non-fungible token,' the term behind NFTs. Its opposite — non-fungible — marks things that are unique and irreplaceable, such as a signed painting or a deed to a specific house.
(Law) A fungible thing; an item of a type that may be mutually substituted, such as money, grain, or oil.
"Under the contract, the grain delivered was treated simply as a fungible."
The noun use is largely confined to legal contexts.
Replaceable by an identical item; interchangeable with other units of the same kind.
"Bitcoin is designed to be fungible, so any one coin equals any other."
The plural appears almost exclusively in legal writing, where 'fungibles' denotes interchangeable goods collectively.
"The warehouse stored bulk fungibles such as grain and fuel."
The word behind NFTs: 'non-fungible' literally just means 'you can't swap it for an identical copy' — like trading cards versus dollar bills.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fungible
Fungible derives from the Latin verb fungī ('to perform, discharge'), through its participle form functus, which also underlies words such as 'function' and 'defunct.' The term entered English via Roman and civil law, where it described things capable of being discharged or fulfilled by mutual substitution — hence interchangeability. It was applied to economic goods more broadly as modern commercial and financial vocabulary developed.
Related word forms
How fungible is actually used
Primarily used in formal contexts — finance, law, economics, and computing. Since the rise of blockchain technology, the phrase 'non-fungible' has entered popular usage through 'non-fungible tokens' (NFTs), giving the word wider currency than it previously enjoyed.
Easily confused with fungible
Despite the similar sound, 'fungal' relates to fungi (mushrooms and molds), whereas 'fungible' describes goods that are interchangeable.