noun (n)

• entrenchment consisting of an additional interior fortification to prolong the defense(noun.artifact)

  source: wordnet30
• the reduction of expenditures in order to become financially stable(noun.act)

  Synonym:
  curtailment, downsizing
  

  source: wordnet30
• The act or process of retrenching; as, the retrenchment of words in a writing.(noun)

  source: webster1913