Source : Webster's Revised Unabridged Dictionary (1913)

Meddle \Med"dle`\, v. i. [imp. & p. p. {Meddled}; p. pr. & vb.
   n. {Meddling}.] [OE. medlen to mix, OF. medler, mesler, F.
   m[^e]ler, LL. misculare, a dim. fr. L. miscere to mix. ? See
   {Mix}, and cf. {Medley}, {Mellay}.]
   1. To mix; to mingle. [Obs.]

            More to know Did never meddle with my thoughts.
                                                  --Shak.

   2. To interest or engage one's self; to have to do; -- ? a
      good sense. [Obs.] --Barrow.

            Study to be quiet, and to meddle with your own
            business.                             --Tyndale.

   3. To interest or engage one's self unnecessarily or
      impertinently, to interfere or busy one's self improperly
      with another's affairs; specifically, to handle or distrub
      another's property without permission; -- often followed
      by with or in.

            Why shouldst thou meddle to thy hurt? --2 Kings xiv.
                                                  10.

            The civil lawyers . . . have meddled in a matter
            that belongs not to them.             --Locke.

   {To meddle and make}, to intrude one's self into another
      person's concerns. [Archaic] --Shak.

   Syn: To interpose; interfere; intermeddle.

Meddling \Med"dling\, a.
   Meddlesome. --Macaulay.

Source : WordNet®

meddling
     adj : intrusive in a meddling or offensive manner; "an interfering
           old woman"; "bustling about self-importantly making an
           officious nuisance of himself"; "busy about other
           people's business" [syn: {interfering}, {meddlesome}, {officious},
            {busy}, {busybodied}]
     n : the act of altering something secretly or improperly [syn: {tampering}]