The Collaborative International Dictionary of English v.0.48:

Gallantry \Gal"lant*ry\, n.; pl. Gallantries. [F. galanterie.]
   1. Splendor of appearance; ostentatious finery. [Archaic]
      [1913 Webster]

            Guess the gallantry of our church by this . . . when
            the desk whereon the priest read was inlaid with
            plates of silver.                     --Fuller.
      [1913 Webster]

   2. Bravery; intrepidity; as, the troops behaved with great
      gallantry.
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   3. Civility or polite attention to ladies; in a bad sense,
      attention or courtesy designed to win criminal favors from
      a female; freedom of principle or practice with respect to
      female virtue; intrigue.
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   4. Gallant persons, collectively. [R.]
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            Helenus, Antenor, and all the gallantry of Troy.
                                                  --Shak.

   Syn: See Courage, and Heroism.
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WordNet (r) 3.0 (2006):

gallantry
    n 1: the qualities of a hero or heroine; exceptional or heroic
         courage when facing danger (especially in battle); "he
         showed great heroism in battle"; "he received a medal for
         valor" [syn: heroism, gallantry, valor, valour,
         valorousness, valiance, valiancy]
    2: courtesy towards women [syn: chivalry, gallantry,
       politesse]
    3: polite attentiveness to women