Meaning of penal

pe•nal

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.