inmate

inmate — noun

1. someone who is locked up in prison or in a mental hospital, either because they

1.nounB2
Definition

someone who is locked up in prison or in a mental hospital, either because they broke the law or because they need long-term medical supervision

Example

Brooke visited her father at the prison every month while he was an inmate there.

The new inmate, Sahil, received a blue uniform and a bed in a shared cell.

Collocation: new inmate / fellow inmate

Common collocations
  • fellow inmate
  • former inmate
  • fellow inmate
Synonyms
  • prisoner

    more common in everyday speech and job titles (prison officer, prisoner transport); narrower in meaning — only refers to jails and prisons, not hospitals

  • convict

    specifies someone who has been legally found guilty and is serving a sentence; does not cover patients or pre-trial detainees

  • detainee

    someone held temporarily by authorities (e.g. before trial, in immigration holding); implies shorter or less permanent confinement

  • patient

    the correct neutral term for someone receiving medical treatment; used instead of 'inmate' when referring to people in general or psychiatric hospitals in a clinical context

Usage Note

In formal or official contexts (reports, legal documents, facility rules) this term covers both prison populations and patients in psychiatric hospitals. In everyday conversation, 'prisoner' is preferred when referring specifically to people in jail.

Common Mistakes

My uncle is an inmate of the general hospital for a heart condition.
My uncle is a patient at the general hospital for a heart condition.
'Inmate' is used for psychiatric hospitals and prisons, not general medical hospitals.
The inmates gathered outside the stadium gates before the concert.
The crowd gathered outside the stadium gates before the concert.
'Inmate' only describes people confined in an institution, not people at an event.

Synonym discussion

Sense: noun/1

'Prisoner' is the broadest everyday term for anyone who has lost their freedom, covering both pre-trial remand and sentenced individuals. 'Inmate' is more institutional — you encounter it in facility rules, census reports, and official records. 'Convict' narrows the field to someone already found guilty, so it excludes people awaiting trial. 'Detainee' leans toward temporary or administrative custody (immigration holding, military camps), carrying less moral judgment. 'Patient' belongs to the medical domain and is the appropriate word for someone in any hospital, including psychiatric wards. For example: a newspaper headline might say 'Prisoner dies in cell,' but the same facility's annual report would say 'Inmate mortality rate.' A person receiving treatment in a psychiatric ward is a 'patient' to doctors but may be called an 'inmate' in administrative records.

prisoner ↗convict ↗detaineepatient ↗

Common collocations

Nouns

  • fellow inmate
  • former inmate
  • prison inmate
  • psychiatric inmate

Phrases

  • inmate population
  • inmate labour
  • inmate rights
  • inmate classification

Etymology

Old EnglishMiddle EnglishEnglish

'Inmate' was formed in the 1500s by combining the preposition 'in' with the noun 'mate' (a companion or someone you share a home with). At that time it simply meant a person who lives in the same house as you — a housemate. Over the 1700s and 1800s, the meaning shifted as large institutions (prisons, workhouses, asylums) became more common, and 'inmate' came to describe a person confined inside such an institution rather than a voluntary housemate.