supplication

英[,sʌplɪ'keɪʃn] 美[,sʌplɪ'keʃən]

1. a prayer asking God's help as part of a religious service

2. a humble request for help from someone in authority

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

"the priest sank to his knees in prayer"