noun (n)

• a carefully considered thought about something(noun.cognition)

  Example:
  His cogitations were dutifully recorded in his daybook.
  

  source: wordnet30
• attentive consideration and meditation(noun.cognition)

  Example:
  After much cogitation he rejected the offer.
  

  Synonym:
  study
  

  source: wordnet30
• The act of thinking; thought; meditation; contemplation.(noun)

  source: webster1913