noun (n)

• the failure to develop some part or organ(noun.process)

  source: wordnet30
• the act of withholding or withdrawing some book or writing from publication or circulation(noun.act)

  Example:
  A suppression of the newspaper.
  

  Synonym:
  curtailment
  

  source: wordnet30
• forceful prevention; putting down by power or authority(noun.act)

  Example:
  The suppression of heresy.
  

  Synonym:
  crushing, quelling, stifling
  

  source: wordnet30
• (psychology) the conscious exclusion of unacceptable thoughts or desires(noun.act)

  Synonym:
  inhibition
  

  source: wordnet30
• 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.(noun)

  source: webster1913