The Collaborative International Dictionary of English v.0.48:

Sequester \Se*ques"ter\, v. t. [imp. & p. p. Sequestered; p.
   pr. & vb. n. Sequestering.] [F. s['e]questrer, L.
   sequestrare to give up for safe keeping, from sequester a
   depositary or trustee in whose hands the thing contested was
   placed until the dispute was settled. Cf. Sequestrate.]
   1. (Law) To separate from the owner for a time; to take from
      parties in controversy and put into the possession of an
      indifferent person; to seize or take possession of, as
      property belonging to another, and hold it till the
      profits have paid the demand for which it is taken, or
      till the owner has performed the decree of court, or
      clears himself of contempt; in international law, to
      confiscate.
      [1913 Webster]

            Formerly the goods of a defendant in chancery were,
            in the last resort, sequestered and detained to
            enforce the decrees of the court. And now the
            profits of a benefice are sequestered to pay the
            debts of ecclesiastics.               --Blackstone.
      [1913 Webster]

   2. To cause (one) to submit to the process of sequestration;
      to deprive (one) of one's estate, property, etc.
      [1913 Webster]

            It was his tailor and his cook, his fine fashions
            and his French ragouts, which sequestered him.
                                                  --South.
      [1913 Webster]

   3. To set apart; to put aside; to remove; to separate from
      other things.
      [1913 Webster]

            I had wholly sequestered my civil affairss. --Bacon.
      [1913 Webster]

   4. To cause to retire or withdraw into obscurity; to seclude;
      to withdraw; -- often used reflexively.
      [1913 Webster]

            When men most sequester themselves from action.
                                                  --Hooker.
      [1913 Webster]

            A love and desire to sequester a man's self for a
            higher conversation.                  --Bacon.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sequestered \Se*ques"tered\, a.
   Retired; secluded. "Sequestered scenes." --Cowper.
   [1913 Webster]

         Along the cool, sequestered vale of life. --Gray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sequestered
    adj 1: providing privacy or seclusion; "the cloistered academic
           world of books"; "sat close together in the sequestered
           pergola"; "sitting under the reclusive calm of a shade
           tree"; "a secluded romantic spot" [syn: cloistered,
           reclusive, secluded, sequestered]
    2: kept separate and secluded; "a sequestered jury"

Moby Thesaurus II by Grady Ward, 1.0:

121 Moby Thesaurus words for "sequestered":
   abstruse, alienated, anchoritic, anonymous, at rest, beclouded,
   blind, buried, calm, cloistered, close, closet, closeted, clouded,
   concealed, cool, covered, covert, detached, disarticulated,
   disconnected, disengaged, disjoined, disjoint, disjointed,
   disjunct, dislocated, dispersed, disunited, divided, divorced,
   domestic, dwindling, ebbing, eclipsed, eremitic, estranged,
   even-tenored, halcyon, hermetic, hermitic, hermitish, hid, hidden,
   hushed, impassive, in a cloud, in a fog, in eclipse, in purdah,
   in the wings, incognito, incommunicado, inmost, innermost,
   interior, intimate, inward, isolated, latent, moldering,
   mysterious, obfuscated, obscure, obscured, occult, pacific,
   peaceable, peaceful, personal, placid, private, privy, quiescent,
   quiet, recluse, recondite, removed, reposeful, reposing, restful,
   resting, retired, scattered, secluded, secluse, seclusive, secret,
   segregated, separated, sequestrated, sheltered, shut in, shut off,
   shut up, smooth, stay-at-home, still, still as death, stillish,
   stilly, stoic, stolid, subsiding, tranquil, unagitated,
   under an eclipse, under cover, under house arrest, under wraps,
   underground, undisturbed, unknown, unmoved, unperturbed, unruffled,
   unstirring, untroubled, waning, withdrawn, wrapped in clouds