The Collaborative International Dictionary of English v.0.48:

Interruption \In`ter*rup"tion\, n. [L. interruptio: cf. F.
   interruption.]
   [1913 Webster]
   1. The act of interrupting, or breaking in upon.
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   2. The state of being interrupted; a breach or break, caused
      by the abrupt intervention of something foreign;
      intervention; interposition. --Sir M. Hale.
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            Lest the interruption of time cause you to lose the
            idea of one part.                     --Dryden.
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   3. Obstruction caused by breaking in upon course, current,
      progress, or motion; stop; hindrance; as, the author has
      met with many interruptions in the execution of his work;
      the speaker or the argument proceeds without interruption.
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   4. Temporary cessation; intermission; suspension.
      [1913 Webster]

WordNet (r) 3.0 (2006):

interruption
    n 1: an act of delaying or interrupting the continuity; "it was
         presented without commercial breaks"; "there was a gap in
         his account" [syn: break, interruption, disruption,
         gap]
    2: some abrupt occurrence that interrupts an ongoing activity;
       "the telephone is an annoying interruption"; "there was a
       break in the action when a player was hurt" [syn:
       interruption, break]
    3: a time interval during which there is a temporary cessation
       of something [syn: pause, intermission, break,
       interruption, suspension]