Meaning

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

noun a humble request for help from someone in authority

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

originFrom Middle English supplicacioun, supplication, from Old French supplication, from Latin supplicatio, supplicationem, from supplicare (“to supplicate”). By surface analysis, supplicate + -ion.

Etymology from Wiktionary, CC BY-SA 3.0