Degenerate

1. (of qualities) Having deteriorated, degraded or fallen from normal, coherent, balanced and desirable to undesirable and typically abnormal.
2. (of a human or system) Having lost good or desirable qualities.
3. (of an encoding or function) Having multiple domain elements correspond to one element of the range.The genetic code is degenerate because a single amino acid can be coded by one of several codons.
4. (mathematics) Relating to degeneracy
5. (physics) Having the same quantum energy level.