Of or pertaining to punishment.Constituting punishment; inflicted as a punishment.Subject to penalty; incurring punishment: as, penal neglect.Used as a place of punishment: as, a penal settlement.Payable or forfeitable as a punishment, as on account of breach of contract, etc.: as, a penal sum.In a more general sense, those statutes which impose a new liability for the doing or omitting of an act. Thus, a statute making the officers of a corporation personally liable for its debts if they neglect to file an annual report of its affairs is apenal statute.