supplication

Words with a similar base: supplication

'supplication'

[invocation.n.01] as in: a prayer asking God's help as part of a religious service

'supplication'

[supplication.n.02] as in: a humble request for help from someone in authority

'supplication'

[prayer.n.01] as in: the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving)

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Examples:
the priest sank to his knees in prayer