The Collaborative International Dictionary of English v.0.48:

Implore \Im*plore"\, v. t. [imp. & p. p. Implored; p. pr. &
   vb. n. Imploring.] [L. implorare; pref. im- in + plorare to
   cry aloud. See Deplore.]
   To call upon, or for, in supplication; to beseech; to pray
   to, or for, earnestly; to petition with urgency; to entreat;
   to beg; -- followed directly by the word expressing the thing
   sought, or the person from whom it is sought.
   [1913 Webster]

         Imploring all the gods that reign above. --Pope.
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         I kneel, and then implore her blessing.  --Shak.

   Syn: To beseech; supplicate; crave; entreat; beg; solicit;
        petition; prey; request; adjure. See Beseech.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Implore \Im*plore"\, v. i.
   To entreat; to beg; to prey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Implore \Im*plore"\, n.
   Imploration. [Obs.] --Spencer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

implore
    v 1: call upon in supplication; entreat; "I beg you to stop!"
         [syn: beg, implore, pray]