noun (n)

• a long and thoughtful observation(noun.act)

  source: wordnet30
• a calm, lengthy, intent consideration(noun.cognition)

  Synonym:
  musing, reflection, reflexion, rumination, thoughtfulness
  

  source: wordnet30
• The act of the mind in considering with attention; continued attention of the mind to a particular subject; meditation; musing; study.(noun)

  source: webster1913