The Collaborative International Dictionary of English v.0.48:

Broad \Broad\ (br[add]d), a. [Compar. Broader
   (br[add]d"[~e]r); superl. Broadest.] [OE. brod, brad, AS.
   br[=a]d; akin to OS. br[=e]d, D. breed, G. breit, Icel.
   brei[eth]r, Sw. & Dan. bred, Goth. braids. Cf. Breadth.]
   1. Wide; extend in breadth, or from side to side; -- opposed
      to narrow; as, a broad street, a broad table; an inch
      broad.
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   2. Extending far and wide; extensive; vast; as, the broad
      expanse of ocean.
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   3. Extended, in the sense of diffused; open; clear; full.
      "Broad and open day." --Bp. Porteus.
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   4. Fig.: Having a large measure of any thing or quality; not
      limited; not restrained; -- applied to any subject, and
      retaining the literal idea more or less clearly, the
      precise meaning depending largely on the substantive.
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            A broad mixture of falsehood.         --Locke.
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   Note: Hence:
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   5. Comprehensive; liberal; enlarged.
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            The words in the Constitution are broad enough to
            include the case.                     --D. Daggett.
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            In a broad, statesmanlike, and masterly way. --E.
                                                  Everett.
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   6. Plain; evident; as, a broad hint.
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   7. Free; unrestrained; unconfined.
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            As broad and general as the casing air. --Shak.
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   8. (Fine Arts) Characterized by breadth. See Breadth.
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   9. Cross; coarse; indelicate; as, a broad compliment; a broad
      joke; broad humor.
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   10. Strongly marked; as, a broad Scotch accent.
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   Note: Broad is often used in compounds to signify wide,
         large, etc.; as, broad-chested, broad-shouldered,
         broad-spreading, broad-winged.
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   Broad acres. See under Acre.

   Broad arrow, originally a pheon. See Pheon, and Broad
      arrow under Arrow.

   As broad as long, having the length equal to the breadth;
      hence, the same one way as another; coming to the same
      result by different ways or processes.
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            It is as broad as long, whether they rise to others,
            or bring others down to them.         --L'Estrange.
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   Broad pennant. See under Pennant.
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   Syn: Wide; large; ample; expanded; spacious; roomy;
        extensive; vast; comprehensive; liberal.
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The Collaborative International Dictionary of English v.0.48:

Broad \Broad\, n.
   1. The broad part of anything; as, the broad of an oar.
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   2. The spread of a river into a sheet of water; a flooded
      fen. [Local, Eng.] --Southey.
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   3. A lathe tool for turning down the insides and bottoms of
      cylinders. --Knight.
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   4. A woman, especially one who is sexually promiscuous; --
      usually considered offensive. [slang]
      [PJC] broad-axe
      Broadaxe
      Broadax

WordNet (r) 3.0 (2006):

broad
    adj 1: having great (or a certain) extent from one side to the
           other; "wide roads"; "a wide necktie"; "wide margins";
           "three feet wide"; "a river two miles broad"; "broad
           shoulders"; "a broad river" [syn: wide, broad] [ant:
           narrow]
    2: broad in scope or content; "across-the-board pay increases";
       "an all-embracing definition"; "blanket sanctions against
       human-rights violators"; "an invention with broad
       applications"; "a panoptic study of Soviet nationality"-
       T.G.Winner; "granted him wide powers" [syn: across-the-
       board, all-embracing, all-encompassing, all-inclusive,
       blanket(a), broad, encompassing, extensive,
       panoptic, wide]
    3: not detailed or specific; "a broad rule"; "the broad outlines
       of the plan"; "felt an unspecific dread" [syn: broad,
       unspecific]
    4: lacking subtlety; obvious; "gave us a broad hint that it was
       time to leave" [syn: broad, unsubtle]
    5: being at a peak or culminating point; "broad daylight"; "full
       summer" [syn: broad(a), full(a)]
    6: very large in expanse or scope; "a broad lawn"; "the wide
       plains"; "a spacious view"; "spacious skies" [syn: broad,
       spacious, wide]
    7: (of speech) heavily and noticeably regional; "a broad
       southern accent"
    8: showing or characterized by broad-mindedness; "a broad
       political stance"; "generous and broad sympathies"; "a
       liberal newspaper"; "tolerant of his opponent's opinions"
       [syn: broad, large-minded, liberal, tolerant]
    n 1: slang term for a woman; "a broad is a woman who can throw a
         mean punch"