The Collaborative International Dictionary of English v.0.48:

Accompany \Ac*com"pa*ny\, v. t. [imp. & p. p. Accompanied; p.
   pr. & vb. n. Accompanying] [OF. aacompaignier, F.
   accompagner, to associate with, fr. OF. compaign, compain,
   companion. See Company.]
   1. To go with or attend as a companion or associate; to keep
      company with; to go along with; -- followed by with or by;
      as, he accompanied his speech with a bow.
      [1913 Webster]

            The Persian dames, . . .
            In sumptuous cars, accompanied his march. --Glover.
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            They are never alone that are accompanied with noble
            thoughts.                             --Sir P.
                                                  Sidney.
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            He was accompanied by two carts filled with wounded
            rebels.                               --Macaulay.
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   2. To cohabit with. [Obs.] --Sir T. Herbert.
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   Syn: To attend; escort; go with.

   Usage: To Accompany, Attend, Escort. We accompany those
          with whom we go as companions. The word imports an
          equality of station. We attend those whom we wait upon
          or follow. The word conveys an idea of subordination.
          We escort those whom we attend with a view to guard
          and protect. A gentleman accompanies a friend to some
          public place; he attends or escorts a lady.
          [1913 Webster]

WordNet (r) 3.0 (2006):

accompanying
    adj 1: following or accompanying as a consequence; "an excessive
           growth of bureaucracy, with attendant problems"; "snags
           incidental to the changeover in management"; "attendant
           circumstances"; "the period of tension and consequent
           need for military preparedness"; "the ensuant response to
           his appeal"; "the resultant savings were considerable"
           [syn: attendant, consequent, accompanying,
           concomitant, incidental, ensuant, resultant,
           sequent]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "accompanying":
   accessory, accidental, accordant, ado, afloat, afoot, agreeing,
   associate, associated, at one with, attendant, attending,
   circumstantial, coacting, coactive, coadunate, coetaneous,
   coeternal, coeval, coexistent, coexisting, coincident,
   coinstantaneous, collaborative, collateral, collective, collusive,
   combined, combining, concerted, concomitant, concordant,
   concurrent, concurring, conjoint, consilient, conspiratorial,
   contemporaneous, contemporary, conterminous, cooperant,
   cooperative, coordinate, correlative, coterminous, coupled,
   coworking, current, doing, eventuating, fellow, going on,
   happening, harmonious, in hand, in the wind, incidental,
   isochronal, isochronous, joined, joint, meeting, mutual,
   occasional, occurring, on, on foot, ongoing, paired, parallel,
   parasitic, passing, prevailing, prevalent, resultant, saprophytic,
   simultaneous, symbiotic, synchronous, synergetic, synergic,
   synergistic, taking place, twin, under way, unison, unisonous,
   united, uniting