[fun.gi.ble] n (ca. 1765): something that is fungible--usu. used in pl.
[2]fungible adj [NL fungibilis, fr. L fungi to perform--more at function] (1818) 1: being of such a nature that one part or quantity may be replaced by another equal part or quantity in the satisfaction of an obligation "oil, wheat, and lumber are ~ commodities"
2: interchangeable -- fun.gi.bil.i.ty n