The Collaborative International Dictionary of English v.0.48:

Abroad \A*broad"\, adv. [Pref. a- + broad.]
   1. At large; widely; broadly; over a wide space; as, a tree
      spreads its branches abroad.
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            The fox roams far abroad.             --Prior.
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   2. Without a certain confine; outside the house; away from
      one's abode; as, to walk abroad.
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            I went to St. James', where another was preaching in
            the court abroad.                     --Evelyn.
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   3. Beyond the bounds of a country; in foreign countries; as,
      we have broils at home and enemies abroad. "Another prince
      . . . was living abroad." --Macaulay.
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   4. Before the public at large; throughout society or the
      world; here and there; widely.
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            He went out, and began to publish it much, and to
            blaze abroad the matter.              --Mark i. 45.
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   To be abroad.
      (a) To be wide of the mark; to be at fault; as, you are
          all abroad in your guess.
      (b) To be at a loss or nonplused.
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WordNet (r) 3.0 (2006):

abroad
    adv 1: to or in a foreign country; "they had never travelled
           abroad"
    2: far away from home or one's usual surroundings; "looking
       afield for new lands to conquer"- R.A.Hall [syn: afield,
       abroad]
    3: in a place across an ocean [syn: overseas, abroad]
    adj 1: in a foreign country; "markets abroad"; "overseas
           markets" [syn: abroad, overseas]

Moby Thesaurus II by Grady Ward, 1.0:

109 Moby Thesaurus words for "abroad":
   abashed, aberrant, adrift, afield, alfresco, all abroad, all off,
   all wrong, amiss, askew, astray, at fault, at large, at sea, away,
   away from home, awry, beside the mark, bewildered, beyond seas,
   bothered, broadly, clear, clueless, confused, corrupt, deceptive,
   defective, delusive, deviant, deviational, deviative, discomposed,
   disconcerted, dismayed, disoriented, distantly and broadly,
   distorted, distracted, distraught, disturbed, embarrassed,
   en plein air, errant, erring, erroneous, everywhere, extensively,
   fallacious, false, far afield, far and near, far and wide,
   faultful, faulty, flawed, guessing, heretical, heterodox,
   illogical, illusory, in a fix, in a maze, in a pickle, in a scrape,
   in a stew, in foreign parts, in the open, infinitely, lost, mazed,
   nonresident, not in residence, not right, not true, off,
   off the track, on all sides, on every side, on leave,
   on sabbatical leave, on the road, on tour, out, out of doors,
   outdoors, outside, oversea, overseas, peccant, perturbed, perverse,
   perverted, publicly, put-out, right and left, self-contradictory,
   straying, turned around, unfactual, unorthodox, unproved, untrue,
   upset, vastly, wide, widely, without a clue, wrong