Source : Webster's Revised Unabridged Dictionary (1913)

Fulfill \Ful*fill"\, v. t. [imp. & p. p. {Fulfilled}; p. pr. &
   vb. n. {Fulfilling}.] [OE. fulfillen, fulfullen, AS.
   fulfyllan; ful full + fyllan to fill. See {Full}, a., and
   {Fill}, v. t.] [Written also {fulfil.}]
   1. To fill up; to make full or complete. [>Obs.] ``Fulfill
      her week'' --Gen. xxix. 27.

            Suffer thou that the children be fulfilled first,
            for it is not good to take the bread of children and
            give to hounds.                       --Wyclif (Mark
                                                  vii. 27).

   2. To accomplish or carry into effect, as an intention,
      promise, or prophecy, a desire, prayer, or requirement,
      etc.; to complete by performance; to answer the
      requisitions of; to bring to pass, as a purpose or design;
      to effectuate.

            He will, fulfill the desire of them fear him. --Ps.
                                                  cxlv. 199.

            Here Nature seems fulfilled in all her ends.
                                                  --Milton.

            Servants must their masters' minds fulfill. --Shak.

Source : WordNet®

fulfil
     v 1: put in effect; "carry out a task"; "execute the decision of
          the people"; "He actioned the operation" [syn: {carry
          through}, {accomplish}, {execute}, {carry out}, {action},
           {fulfill}]
     2: fill or meet a want or need [syn: {meet}, {satisfy}, {fill},
         {fulfill}]
     3: fulfil the requirements or expectations of [syn: {satisfy},
        {fulfill}, {live up to}] [ant: {fall short of}]
     [also: {fulfilling}, {fulfilled}]