noun (n)

• the rational and systematic study of religion and its influences and of the nature of religious truth(noun.cognition)

  Synonym:
  divinity
  

  source: wordnet30
• a particular system or school of religious beliefs and teachings(noun.cognition)

  Example:
  Jewish theology.
  Roman Catholic theology.
  

  Synonym:
  theological system
  

  source: wordnet30
• the learned profession acquired by specialized courses in religion (usually taught at a college or seminary)(noun.act)

  Example:
  He studied theology at Oxford.
  

  source: wordnet30
• The science of God or of religion; the science which treats of the existence, character, and attributes of God, his laws and government, the doctrines we are to believe, and the duties we are to practice; divinity; (as more commonly understood) "the knowledge derivable from the Scriptures, the systematic exhibition of revealed truth, the science of Christian faith and life."(noun)

  source: webster1913