noun (n)

• the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving)(noun.act)

  Example:
  The priest sank to his knees in prayer.
  

  Synonym:
  supplication
  

  source: wordnet30
• reverent petition to a deity(noun.communication)

  Synonym:
  orison, petition
  

  source: wordnet30
• earnest or urgent request(noun.communication)

  Synonym:
  appeal, entreaty
  

  source: wordnet30
• a fixed text used in praying(noun.communication)

  source: wordnet30
• someone who prays to God(noun.person)

  Synonym:
  supplicant
  

  source: wordnet30
• One who prays; a supplicant.(noun)

  source: webster1913
• The act of praying, or of asking a favor; earnest request or entreaty; hence, a petition or memorial addressed to a court or a legislative body.(noun)

  source: webster1913