noun (n)

• the formal act of approving(noun.act)

  Example:
  His decision merited the approval of any sensible person.
  

  Synonym:
  approving, blessing
  Antonym:
  disapproval
  

  source: wordnet30
• a feeling of liking something or someone good(noun.feeling)

  Example:
  Although she fussed at them, she secretly viewed all her children with approval.
  

  source: wordnet30
• acceptance as satisfactory(noun.state)

  Example:
  He bought it on approval.
  

  Synonym:
  favorable reception, favourable reception
  

  source: wordnet30
• a message expressing a favorable opinion(noun.communication)

  Example:
  Words of approval seldom passed his lips.
  

  Synonym:
  commendation
  

  source: wordnet30
• Approbation; sanction.(noun)

  source: webster1913