The Collaborative International Dictionary of English v.0.48:

Implement \Im"ple*ment\, v. t.
   1. To accomplish; to fulfill. [R.]
      [1913 Webster]

            Revenge . . . executed and implemented by the hand
            of Vanbeest Brown.                    --Sir W.
                                                  Scott.
      [1913 Webster]

   2. To provide with an implement or implements; to cause to be
      fulfilled, satisfied, or carried out, by means of an
      implement or implements.
      [1913 Webster]

            The chief mechanical requisites of the barometer are
            implemented in such an instrument as the following.
                                                  --Nichol.
      [1913 Webster]

   3. (Scots Law) To fulfill or perform, as a contract or an
      engagement.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Implement \Im"ple*ment\ ([i^]m"pl[-e]*ment), n. [LL. implementum
   accomplishment, fr. L. implere, impletum, to fill up, finish,
   complete; pref. im- in + plere to fill. The word was perh.
   confused with OF. empleier, emploier, to employ, F. employer,
   whence E. employ. See Plenty.]
   That which fulfills or supplies a want or use; esp., an
   instrument, tool, or utensil, as supplying a requisite to an
   end; as, the implements of trade, of husbandry, or of war.
   [1913 Webster]

         Genius must have talent as its complement and
         implement.                               --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

implement
    n 1: instrumentation (a piece of equipment or tool) used to
         effect an end
    v 1: apply in a manner consistent with its purpose or design;
         "implement a procedure"
    2: ensure observance of laws and rules; "Apply the rules to
       everyone"; [syn: enforce, implement, apply] [ant:
       exempt, free, relieve]
    3: pursue to a conclusion or bring to a successful issue; "Did
       he go through with the treatment?"; "He implemented a new
       economic plan"; "She followed up his recommendations with a
       written proposal" [syn: follow through, follow up,
       follow out, carry out, implement, put through, go
       through]

Moby Thesaurus II by Grady Ward, 1.0:

133 Moby Thesaurus words for "implement":
   Charlie McCarthy, Federal, abide by, accomplish, achieve,
   actualize, adhere to, administer, agent, amanuensis, ancilla,
   apparatus, appliance, baggage agent, bring about, bring off,
   bring to effect, bring to pass, business agent, carry into effect,
   carry into execution, carry off, carry out, carry through, cause,
   claim agent, clerk, come through, come through with,
   commercial agent, commission agent, complete, consignee,
   contraption, contrivance, creature, customer agent, device,
   discharge, dummy, dupe, effect, effectuate, enforce, execute,
   factor, fed, federal agent, fill out, freight agent, fulfill,
   functionary, gadget, general agent, get through, gimcrack, gimmick,
   gizmo, go through, go-between, hand tool, handmaid, handmaiden,
   honor, instrument, insurance agent, interagent, intermediary,
   intermediate, intermedium, invoke, land agent, law agent, lever,
   literary agent, loan agent, make, make out, materialize, means,
   mechanical device, mechanism, mediator, medium, midwife, minion,
   news agent, observe, official, organ, parliamentary agent,
   passenger agent, pawn, perform, plaything, power tool,
   precision tool, press agent, promulgate, prosecute, pull off,
   puppet, purchasing agent, put across, put in force,
   put in practice, put into effect, put into practice, put over,
   put through, real estate agent, realize, render, sales agent,
   secretary, servant, slave, special agent, speed tool,
   station agent, steward, stooge, theatrical agent, ticket agent,
   tool, toy, transact, translate into action, travel agent, utensil,
   vehicle, walking delegate, work out