noun (n)

• continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature(noun.cognition)

  Example:
  The habit of meditation is the basis for all real knowledge.
  

  Synonym:
  speculation
  

  source: wordnet30
• (religion) contemplation of spiritual matters (usually on religious or philosophical subjects)(noun.cognition)

  source: wordnet30
• The act of meditating; close or continued thought; the turning or revolving of a subject in the mind; serious contemplation; reflection; musing.(noun)

  source: webster1913