noun (n)

• process or result of becoming less or smaller(noun.event)

  Example:
  The material lost 2 inches per yard in shrinkage.
  

  Synonym:
  shrinking
  

  source: wordnet30
• the amount by which something shrinks(noun.attribute)

  source: wordnet30
• the act of stealing goods that are on display in a store(noun.act)

  Example:
  Shrinkage is the retail trade's euphemism for shoplifting.
  

  Synonym:
  shoplifting
  

  source: wordnet30
• The act of shrinking; a contraction into less bulk or measurement.(noun)

  source: webster1913