Source : Webster's Revised Unabridged Dictionary (1913)

Supplication \Sup`pli*ca"tion\, n. [F. supplication, L.
   supplicatio.]
   1. The act of supplicating; humble and earnest prayer, as in
      worship.

   2. A humble petition; an earnest request; an entreaty.

   3. (Rom. Antiq.) A religious solemnity observed in
      consequence of some military success, and also, in times
      of distress and danger, to avert the anger of the gods.

   Syn: Entreaty; petition; solicitation; craving.

Source : WordNet®

supplication
     n 1: a prayer asking God's help as part of a religious service
          [syn: {invocation}]
     2: a humble request for help from someone in authority [syn: {plea}]
     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" [syn: {prayer}]