Source : Webster's Revised Unabridged Dictionary (1913)

Thrice \Thrice\, adv. [OE. thries; thrie thrice (AS.
   [thorn]riga, [thorn]riwa) + -s, the adverbal suffix. See
   {Three}, and {-wards}.]
   1. Three times. ``Thrice in vain.'' --Spenser.

            Verily I say unto thee. That this night, before the
            cock crow, thou shalt deny me thrice. --Matt. xxvi.
                                                  34.

   2. In a threefold manner or degree; repeatedly; very.

            Thrice noble lord, let me entreat of you To pardon
            me.                                   --Shak.

            Thrice is he armed that hath his quarrel just.
                                                  --Shak.

   Note: Thrice is often used, generally with an intensive
         force, to form compounds which are usually of obvious
         meaning; as, in thrice-blessed, thrice-favored,
         thrice-hallowed, thrice-happy, thrice-told, and the
         like.

Source : WordNet®

thrice
     adv : three times; "I called you thrice last night"