A problem whose definition involves an indefinite, infinite, and incompletely known (and defined) number of variables.

A term invented by Geoffrey Fox for a class of problem which is outside the scope of a single computer architecture, but is instead best run on a Metacomputer with many disparate designs. An example is the design and manufacture of a modern aircraft, which presents problems in geometry, grid generation, fluid flow, acoustics, structural analysis, operational research, visualisation, and database management. The Metacomputer for such a Metaproblem would be networked workstations, array processors, vector supercomputers, massively parallel processors, and visualisation engines.