degeneracy

Noun

 * 1) The state of being degenerate in all senses.
 * 2)  The ability of one part of the brain to take over another's function without being overexerted.
 * 3)  A limiting case of a class of objects which appears to be qualitatively different from (and usually simpler than) the rest of the class.
 * 1)  A limiting case of a class of objects which appears to be qualitatively different from (and usually simpler than) the rest of the class.
 * 1)  A limiting case of a class of objects which appears to be qualitatively different from (and usually simpler than) the rest of the class.