The Collaborative International Dictionary of English v.0.48:

Disrupt \Dis*rupt"\, a. [L. disruptus, diruptus, p. p. of
   disrumpere, to break or burst asunder; dis- + rumpere to
   break, burst. See Rupture.]
   Rent off; torn asunder; severed; disrupted.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

disrupt \dis*rupt"\, v. t. [imp. & p. p. Disrupted; p. pr. &
   vb. n. Disrupting.]
   1. To break asunder; to rend. --Thomson.
      [1913 Webster]

   2. to destroy the continuity of, usually temporarily; as,
      electrical power was disrupted by the hurricane.
      [PJC]

   3. To interfere with or halt, especially by causing a lack of
      order; as, the shouting of the demonstrators disrupted the
      meeting.
      [PJC]

WordNet (r) 3.0 (2006):

disrupt
    v 1: make a break in; "We interrupt the program for the
         following messages" [syn: interrupt, disrupt, break
         up, cut off]
    2: throw into disorder; "This event disrupted the orderly
       process"
    3: interfere in someone else's activity; "Please don't interrupt
       me while I'm on the phone" [syn: interrupt, disrupt]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "disrupt":
   agitate, atomize, baffle, balk, blast, brave, breach, break in,
   break into, break into pieces, break to pieces, break up,
   challenge, checkmate, circumvent, confound, confront, contravene,
   counter, counteract, countermand, counterwork, crash, cross,
   crunch, crush, cut to pieces, dash, defeat, defy, demolish,
   destroy, diffuse, disarray, discomfit, discompose, disconcert,
   discountenance, dish, disorder, disorganize, disperse, disturb,
   elude, fission, flummox, foil, fragment, frustrate, grind, hole,
   interfere with, interrupt, knock the chocks, make mincemeat of,
   mess up, mince, muddle, nonplus, open, perplex, pulverize, ruin,
   rummage, rupture, sabotage, scatter, scotch, shake up, shatter,
   shiver, smash, smash up, spike, splinter, spoil, squash, squish,
   stonewall, stump, thwart, unsettle, upset