noun (n)

• feelings of ardent love(noun.feeling)

  Example:
  Their devotion to each other was beautiful.
  

  Synonym:
  devotedness
  

  source: wordnet30
• commitment to some purpose(noun.act)

  Example:
  The devotion of his time and wealth to science.
  

  source: wordnet30
• religious zeal; the willingness to serve God(noun.act)

  Synonym:
  cultism, idolatry, veneration
  

  source: wordnet30
• (usually plural) religious observance or prayers (usually spoken silently)(noun.act)

  Example:
  He returned to his devotions.
  

  source: wordnet30
• The act of devoting; consecration.(noun)

  source: webster1913