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]