Source : Webster's Revised Unabridged Dictionary (1913)

Inmate \In"mate`\, a.
   Admitted as a dweller; resident; internal. [R.] ``Inmate
   guests.'' --Milton.

Inmate \In"mate`\, n. [In + mate an associate.]
   One who lives in the same house or apartment with another; a
   fellow lodger; esp.,one of the occupants of an asylum,
   hospital, or prison; by extension, one who occupies or lodges
   in any place or dwelling.

         So spake the enemy of mankind, inclos'd In serpent,
         inmate bad.                              --Milton.

Source : WordNet®

inmate
     n 1: one of several resident of a dwelling (especially someone
          confined to a prison or hospital)
     2: a patient who is residing in the hospital where he is being
        treated [syn: {inpatient}] [ant: {outpatient}]
     3: a person serving a sentence in a jail or prison [syn: {convict},
         {con}, {jailbird}, {gaolbird}]