The Collaborative International Dictionary of English v.0.48:

Seclusion \Se*clu"sion\, n. [See Seclude.]
   The act of secluding, or the state of being secluded;
   separation from society or connection; a withdrawing;
   privacy; as, to live in seclusion.
   [1913 Webster]

         O blest seclusion from a jarring world, which he, thus
         occupied, enjoys!                        --Cowper.
   [1913 Webster]

   Syn: Solitude; separation; withdrawment; retirement; privacy.
        See Solitude.
        [1913 Webster]

WordNet (r) 3.0 (2006):

seclusion
    n 1: the quality of being secluded from the presence or view of
         others [syn: privacy, privateness, seclusion]
    2: the act of secluding yourself from others