The Collaborative International Dictionary of English v.0.48:

Incarcerate \In*car"cer*ate\, v. t. [imp. & p. p.
   Incarcerated; p. pr. & vb. n. Incarcerating.] [Pref. in-
   in + L. carceratus, p. p. of carcerare to imprison, fr.
   carcer prison.]
   [1913 Webster]
   1. To imprison; to confine in a jail or prison.
      [1913 Webster]

   2. To confine; to shut up or inclose; to hem in.
      [1913 Webster]

   Incarcerated hernia (Med.), hernia in which the
      constriction can not be easily reduced.
      [1913 Webster] incarcerate

The Collaborative International Dictionary of English v.0.48:

incarcerate \in*car"cer*ate\, incarcerated \in*car"cer*at*ed\,
   a.
   Imprisoned. --Dr. H. More.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incarcerate
    v 1: lock up or confine, in or as in a jail; "The suspects were
         imprisoned without trial"; "the murderer was incarcerated
         for the rest of his life" [syn: imprison, incarcerate,
         lag, immure, put behind bars, jail, jug, gaol,
         put away, remand]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "incarcerate":
   bastille, beleaguer, beset, besiege, blockade, bolt in, bound,
   box in, cage, cast in prison, chamber, clap in jail, clap up,
   close in, compass, confine, constrain, contain, coop, coop in,
   coop up, cordon, cordon off, corral, encircle, enclose, encompass,
   enshrine, fence in, gaol, hedge in, hem in, hold captive,
   hold in captivity, hold prisoner, house in, immure, impound,
   imprison, include, intern, jail, jug, kennel, leaguer, lock in,
   lock up, mew, mew up, pen, pen in, pocket, quarantine, quod,
   rail in, shrine, shut in, shut up, stable, surround,
   throw into jail, wall in, wrap, yard, yard up