n. 1. a diagram of a hollow solid consisting of the plane shapes of the faces so arranged that the diagram could be folded to form the solid. Nets of a cube and a pyramid. 2. also called Moore-Smith sequence. a generalization of the concept of a sequence to permit talk of convergence in non-metrizable topological spaces: a net of a set S is a mapping from a directed set D into S. See net convergence. 3. see epsilon net.