The Collaborative International Dictionary of English v.0.48:

Thereabout \There"a*bout`\, Thereabouts \There"a*bouts`\, adv.
   [The latter spelling is less proper, but more commonly used.]
   1. Near that place.
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   2. Near that number, degree, or quantity; nearly; as, ten
      men, or thereabouts.
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            Five or six thousand horse . . . or thereabouts.
                                                  --Shak.
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            Some three months since, or thereabout. --Suckling.
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   3. Concerning that; about that. [R.]
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            What will ye dine? I will go thereabout. --Chaucer.
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            They were much perplexed thereabout.  --Luke xxiv.
                                                  4.
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WordNet (r) 3.0 (2006):

thereabouts
    adv 1: near that time or date; "come at noon or thereabouts"
           [syn: thereabout, thereabouts]
    2: near that place; "he stayed in London or thereabouts for
       several weeks" [syn: thereabout, thereabouts]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "thereabouts":
   about, along toward, around, at close quarters, at hand, close,
   close about, close at hand, close by, fast by, hard, hard by,
   hereabout, hereabouts, in spitting distance, in that place,
   in that vicinity, in those parts, near, near at hand, nearabout,
   nearabouts, nearby, nigh, nigh about, not far, only a step, there,
   thereabout, thereat, thither, thitherward, thitherwards,
   to that place, within call, within earshot, within hearing,
   within reach