The Collaborative International Dictionary of English v.0.48:

Seclude \Se*clude\, v. t. [imp. & p. p. Secluded; p. pr. & vb.
   n. Secluding.] [L. secludere, seclusum; pref. se- aside +
   claudere to shut. See Close, v. t.]
   1. To shut up apart from others; to withdraw into, or place
      in, solitude; to separate from society or intercourse with
      others.
      [1913 Webster]

            Let Eastern tyrants from the light of heaven
            Seclude their bosom slaves.           --Thomson.
      [1913 Webster]

   2. To shut or keep out; to exclude. [Obs.] --Evelyn.
      [1913 Webster] -- Se*clud"ed*ly, adv. --
      Se*clud"ed*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

seclude
    v 1: keep away from others; "He sequestered himself in his study
         to write a book" [syn: seclude, sequester,
         sequestrate, withdraw]