The Collaborative International Dictionary of English v.0.48:

Suppress \Sup*press"\, v. t. [imp. & p. p. Suppressed; p. pr.
   & vb. n. Suppressing.] [L. suppressus, p. p. of supprimere
   to suppress; sub under + premere, pressum, to press. See
   Sub-, and Press.]
   1. To overpower and crush; to subdue; to put down; to quell.
      [1913 Webster]

            Every rebellion, when it is suppressed, doth make
            the subject weaker, and the prince stronger. --Sir
                                                  J. Davies.
      [1913 Webster]

   2. To keep in; to restrain from utterance or vent; as, to
      suppress the voice; to suppress a smile. --Sir W. Scott.
      [1913 Webster]

   3. To retain without disclosure; to conceal; not to reveal;
      to prevent publication of; as, to suppress evidence; to
      suppress a pamphlet; to suppress the truth.
      [1913 Webster]

            She suppresses the name, and this keeps him in a
            pleasing suspense.                    --Broome.
      [1913 Webster]

   4. To stop; to restrain; to arrest the discharges of; as, to
      suppress a diarrhea, or a hemorrhage.
      [1913 Webster]

   Syn: To repress; restrain; put down; overthrow; overpower;
        overwhelm; conceal; stifle; stop; smother.
        [1913 Webster]

WordNet (r) 3.0 (2006):

suppressed
    adj 1: kept from public knowledge by various means; [ant:
           publicised, publicized]
    2: manifesting or subjected to suppression; "a suppressed press"
    3: held in check with difficulty; "a smothered cough"; "a
       stifled yawn"; "a strangled scream"; "suppressed laughter"
       [syn: smothered, stifled, strangled, suppressed]