The Collaborative International Dictionary of English v.0.48:

Gallant \Gal"lant\ (g[a^]l"lant), a. [F. gallant, prop. p. pr.
   of OF. galer to rejoice, akin to OF. gale amusement, It. gala
   ornament; of German origin; cf. OHG. geil merry, luxuriant,
   wanton, G. geil lascivious, akin to AS. g[=a]l wanton,
   wicked, OS. g[=e]l merry, Goth. gailjan to make to rejoice,
   or perh. akin to E. weal. See Gala, Galloon.]
   [1913 Webster]
   1. Showy; splendid; magnificent; gay; well-dressed.
      [1913 Webster]

            The town is built in a very gallant place. --Evelyn.
      [1913 Webster]

            Our royal, good and gallant ship.     --Shak.
      [1913 Webster]

   2. Noble in bearing or spirit; brave; high-spirited;
      courageous; heroic; magnanimous; as, a gallant youth; a
      gallant officer.
      [1913 Webster]

            That gallant spirit hath aspired the clouds. --Shak.
      [1913 Webster]

            The gay, the wise, the gallant, and the grave.
                                                  --Waller.

   Syn: Gallant, Courageous, Brave.

   Usage: Courageous is generic, denoting an inward spirit which
          rises above fear; brave is more outward, marking a
          spirit which braves or defies danger; gallant rises
          still higher, denoting bravery on extraordinary
          occasions in a spirit of adventure. A courageous man
          is ready for battle; a brave man courts it; a gallant
          man dashes into the midst of the conflict.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gallant \Gal*lant"\, v. t. [imp. & p. p. Gallanted; p. pr. &
   vb. n. Gallanting.]
   1. To attend or wait on, as a lady; as, to gallant ladies to
      the play.
      [1913 Webster]

   2. To handle with grace or in a modish manner; as, to gallant
      a fan. [Obs.] --Addison.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gallant \Gal*lant"\ (?; 277), a.
   Polite and attentive to ladies; courteous to women;
   chivalrous.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gallant \Gal*lant"\ (?; 277), n.
   1. A man of mettle or spirit; a gay, fashionable man; a young
      blood. --Shak.
      [1913 Webster]

   2. One fond of paying attention to ladies.
      [1913 Webster]

   3. One who wooes; a lover; a suitor; in a bad sense, a
      seducer. --Addison.
      [1913 Webster]

   Note: In the first sense it is by some ortho["e]pists (as in
         Shakespeare) accented on the first syllable.
         [1913 Webster]

WordNet (r) 3.0 (2006):

gallant
    adj 1: unflinching in battle or action; "a gallant warrior";
           "put up a gallant resistance to the attackers"
    2: lively and spirited; "a dashing hero" [syn: dashing,
       gallant]
    3: having or displaying great dignity or nobility; "a gallant
       pageant"; "lofty ships"; "majestic cities"; "proud alpine
       peaks" [syn: gallant, lofty, majestic, proud]
    4: being attentive to women like an ideal knight [syn:
       chivalrous, gallant, knightly]
    n 1: a man who is much concerned with his dress and appearance
         [syn: dandy, dude, fop, gallant, sheik, beau,
         swell, fashion plate, clotheshorse]
    2: a man who attends or escorts a woman [syn: squire,
       gallant]

Moby Thesaurus II by Grady Ward, 1.0:

204 Moby Thesaurus words for "gallant":
   Achilles, Beau Brummel, Casanova, David, Don Juan, Hector,
   Lothario, Roland, Romeo, Samson, a man, abandoned, admirer, adorer,
   amorist, amoroso, attentive, beau, beloved, blade, blood, bold,
   bold-spirited, boulevardier, boyfriend, brave, bravura, braw, buck,
   bulldog, caballero, cavalier, cavaliere servente, ceremonious,
   champion, chevalier, chichi, chivalric, chivalrous, chutzpanik,
   clotheshorse, considerate, courageous, courteous, courtly, coxcomb,
   dandy, daring, dashing, date, dauntless, debauched, debauchee,
   decorated hero, demigod, demigoddess, dignified, dirty old man,
   dissipated, dissolute, doughty, dressy, dude, elegant, escort,
   esquire, exhibitionistic, exquisite, fashion plate, fast, fearless,
   fellow, fighting cock, fine, fine gentleman, flame, flashing,
   flashy, flaunting, fop, formal, free, fribble, frilly, frothy,
   game, gamecock, gay, gay deceiver, gay dog, gentlemanly, gigolo,
   glittering, glorious, good soldier, gracious, grand, greathearted,
   hardy, hero, heroic, heroine, herolike, high-spirited, imposing,
   inamorato, intrepid, ironhearted, jack-a-dandy, jackanapes, jaunty,
   jazzy, knight, knightlike, knightly, lady-killer, lecher,
   libertine, licentious, lion, lionhearted, lothario, lounge lizard,
   love-maker, lover, lover-boy, macaroni, magnificent, majestic, man,
   man of courage, man-about-town, manful, manly, mannerly, masher,
   mettlesome, necker, noble, old man, old-fashioned, old-world,
   paladin, paramour, petter, philanderer, plucky, polite, profligate,
   puppy, rake, rakehell, rakehellish, rakehelly, rakish, rip, roue,
   rounder, satyr, seducer, sheik, showy, skirt chaser, snazzy,
   soldierlike, soldierly, spark, sparker, splashy, splendid, splurgy,
   sport, sporty, squire, stalwart, stately, stout, stouthearted,
   suave, sugar daddy, suitor, swain, sweetheart, swell, swinger,
   the brave, thoughtful, tiger, unafraid, unbridled, undaunted,
   urbane, valiant, valiant knight, valorous, walking phallus, wanton,
   well-bred, wild, wolf, woman chaser, womanizer, wooer, young man