Definitions of suppression:

• noun:   forceful prevention; putting down by power or authority

  Example: "The suppression of heresy"

• noun:   the act of withholding or withdrawing some book or writing from publication or circulation

  Example: "A suppression of the newspaper"

• noun:   (botany) the failure to develop of some part or organ of a plant
• noun:   (psychology) the conscious exclusion of unacceptable thoughts or desires