Source : Webster's Revised Unabridged Dictionary (1913)

Suppression \Sup*pres"sion\, n. [L. suppressio: cf. F.
   suppression.]
   1. The act of suppressing, or the state of being suppressed;
      repression; as, the suppression of a riot, insurrection,
      or tumult; the suppression of truth, of reports, of
      evidence, and the like.

   2. (Med.) Complete stoppage of a natural secretion or
      excretion; as, suppression of urine; -- used in
      contradiction to retention, which signifies that the
      secretion or excretion is retained without expulsion.
      --Quain.

   3. (Gram.) Omission; as, the suppression of a word.

   Syn: Overthrow; destruction; concealment; repression;
        detention; retention; obstruction.

Source : WordNet®

suppression
     n 1: (botany) the failure to develop of some part or organ of a
          plant
     2: the act of withholding or withdrawing some book or writing
        from publication or circulation; "a suppression of the
        newspaper" [syn: {curtailment}]
     3: forceful prevention; putting down by power or authority;
        "the suppression of heresy"; "the quelling of the
        rebellion"; "the stifling of all dissent" [syn: {crushing},
         {quelling}, {stifling}]
     4: (psychology) the conscious exclusion of unacceptable
        thoughts or desires [syn: {inhibition}]