"penitentiary" in the noun sense
1. penitentiary, pen
a correctional institution for those convicted of major crimes
"penitentiary" in the adjective sense
used for punishment or reform of criminals or wrongdoers
2. penitential, penitentiary
showing or constituting penance
"wrote a penitential letter apologizing for her hasty words"
Source: WordNet® (An amazing lexical database of English)
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