The Collaborative International Dictionary of English v.0.48:

Intermeddle \In`ter*med"dle\, v. i. [OE. entremedlen,
   entermellen, to mix together, OF. entremedler, entremeller,
   entremesler, F. entrem[^e]ler. See Inter-, and Meddle.]
   To meddle with the affairs of others; to meddle officiously;
   to interpose or interfere improperly; to mix or meddle with.
   [1913 Webster]

         The practice of Spain hath been, by war and by
         conditions of treaty, to intermeddle with foreign
         states.                                  --Bacon.

   Syn: To interpose; interfere. See Interpose.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Intermeddle \In`ter*med"dle\, v. t.
   To intermix; to mingle. [Obs.]
   [1913 Webster]

         Many other adventures are intermeddled.  --Spenser.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "intermeddle":
   Paul-Pry, arrest, bottle up, busybody, butt in, check,
   countercheck, curb, dam up, damp, dampen, delay, detain, encroach,
   entrench, fool, fool with, hinder, hold back, hold in check,
   hold up, horn in, impede, inhibit, intercept, interfere, interlope,
   interrupt, intervene, invade, keep back, keep in check, kibitz,
   make, meddle, meddle with, mess with, monkey with, nose, oppose,
   pry, repress, resist, restrain, retard, scotch, set back, slacken,
   snoop, snub, suppress, tamper with, trespass