1. (psychology) the conscious exclusion of unacceptable thoughts or desires

    Synonym: inhibition

2. forceful prevention
    putting down by power or authority

    e.g. the suppression of heresy
           the quelling of the rebellion
           the stifling of all dissent

    Synonym: crushingquellingstifling

3. the act of withholding or withdrawing some book or writing from publication or circulation

    e.g. a suppression of the newspaper

    Synonym: curtailment

4. the failure to develop some part or organ