| 1. | of, pertaining to, or involving punishment, as for crimes or offenses. |
| 2. | prescribing punishment: penal laws. |
| 3. | constituting punishment: He survived the years of penal hardship. |
| 4. | used as a place of confinement and punishment: a penal colony. |
| 5. | subject to or incurring punishment: a penal offense. |
| 6. | payable or forfeitable as a penalty: a penal sum. |