Usually used to describe goods of a nature or kind that may be freely exchangeable or replaceable for others of like kind or nature. In finance, fungible assets refers to securities or commodities that are freely mixed and whose ownership is not specifically assigned to particular entities.
I am a retired certified public accountant who audited a New York State school district the first year in which money collected from the sale of lottery tickets went to education. My audit showed that in fact the money from the lottery was fungible: the money the school gained from the lottery was canceled out by other cutbacks in state aid.
—Myron Heckler Letter to the Editor New York Times, April 2, 1999