The Collaborative International Dictionary of English v.0.48:

Restrict \Re*strict"\, v. t. [imp. & p. p. Restricted; p. pr.
   & vb. n. Restricting.]
   To restrain within bounds; to limit; to confine; as, to
   restrict worlds to a particular meaning; to restrict a
   patient to a certain diet.
   [1913 Webster]

   Syn: To limit; bound; circumscribe; restrain; repress; curb;
        coerce.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

classified \classified\ adj.
   1. arranged into classes or categories; as, unclassified.

   Syn: categorized.
        [WordNet 1.5 +PJC]

   2. assigned to a class of documents withheld from general
      circulation; -- of information or documents. Opposite of
      unclassified.

   Note: [Narrower terms: eyes-only; confidential;
         restricted; secret; sensitive; top-secret]
         [WordNet 1.5]

WordNet (r) 3.0 (2006):

restricted
    adj 1: subject to restriction or subjected to restriction; "of
           restricted importance" [ant: unrestricted]
    2: restricted in meaning; (as e.g. `man' in `a tall man') [syn:
       restricted, qualified]
    3: the lowest level of official classification for documents