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Cadeia vs. prisão vs. penitenciária

In Portuguese, the words cadeia, prisão, and penitenciária all refer to places where individuals are confined as a form of punishment or detention, but they differ in usage, connotation, and formality.

Cadeia

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Cadeia is often used to refer to smaller, simpler detention facilities, typically for short-term stays or minor offenses. It is also a more colloquial term that may refer broadly to jail regardless of formality.
Ele foi levado para a cadeia depois de ser pego roubando.
(He was taken to jail after being caught stealing.)
A cadeia da cidade fica ao lado da delegacia.
(The city's jail is next to the police station.)
O ladrão passou apenas uma noite na cadeia antes de ser liberado.
(The thief spent only one night in jail before being released.)

Prisão

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Prisão is a more formal and general term used for any type of facility where people are incarcerated. It can also broadly represent the concept of imprisonment or the legal action of detaining someone.
A prisão do criminoso aconteceu ontem.
(The criminal's arrest happened yesterday.)
Ele foi condenado a 10 anos de prisão.
(He was sentenced to 10 years in prison.)
A prisão de segurança máxima abriga os piores criminosos do país.
(The maximum-security prison houses the country's worst criminals.)

Penitenciária

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Penitenciária specifically refers to long-term correctional facilities meant for individuals convicted of serious crimes. It often conveys a more formal, institutional, and specific meaning.
Os prisioneiros foram transferidos para a penitenciária estadual.
(The prisoners were transferred to the state penitentiary.)
A penitenciária federal possui rígidas normas de segurança.
(The federal penitentiary has strict security rules.)
Ele está cumprindo sua pena em uma penitenciária de segurança máxima.
(He is serving his sentence in a maximum-security penitentiary.)

Summary

While cadeia, prisão, and penitenciária can all mean prison or jail, they differ in connotation and usage. Cadeia is informal and often refers to smaller or temporary detention facilities. Prisão is a general, formal term for any incarceration, encompassing both short and long-term detention. Penitenciária, on the other hand, is highly specific, referring to long-term correctional facilities for serious offenders. Choosing the right term depends on its context and level of formality.