devotion

Noun

• (usually plural) religious observance or prayers (usually spoken silently)
  • he returned to his devotions
    

• religious zeal; the willingness to serve God

• commitment to some purpose
  • the devotion of his time and wealth to science
    

• feelings of ardent love
  • their devotion to each other was beautiful
    

Related words

• Synonyms: 
  idolatry , veneration , cultism , devotedness