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

1400–50; late Middle English < Latin poenālis, equivalent to poen(a) penalty (< Greek poinḗ fine) + -ālis -al1

penality [pi-nal-i-tee] , noun
penally, adverb
nonpenal, adjective
unpenal, adjective
unpenally, adverb

1. penal, penological, punitive ; 2. penal, penile. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
penal (ˈpiːnəl)
1.  of, relating to, constituting, or prescribing punishment
2.  payable as a penalty: a penal sum
3.  used or designated as a place of punishment: a penal institution
[C15: from Late Latin poenālis concerning punishment, from poena penalty]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to punishment," 1439, from O.Fr. peinal (12c.), from M.L. penalis, from L. poenalis "pertaining to punishment," from poena "punishment," from Gk. poine "blood-money, fine, penalty, punishment," from PIE *kwoina, from base *kwei- "to pay, atone, compensate" (cf. Gk. time "price, worth, honor,
esteem, respect," Skt. cinoti "observes, notes," Avestan kaena "punishment, vengeance," O.C.S. cena "honor, price," Lith. kaina "value, price"). Penalty is first attested 1512, from M.Fr. penalité, from M.L. poenalitatem (nom. poenalitas), from L. poenalis. The sporting sense is first recorded 1885. Penalize formed in Eng. 1868.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The penal code is codified in a hardcover book that was kept at the ministry.
Last year the government gave the nod to a workshop that looked into changing
  the penal code.
Every week, on average, a new jail or prison is built to lock up more people in
  the world's largest penal system.
But it is quite something for a department to be accused of having a penal
  policy that is both too tough and too lenient.
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