The Collaborative International Dictionary of English v.0.48:

Lilt \Lilt\ (l[i^]lt), v. i. [Cf. Norw. lilla, lirla, to sing in
   a high tone.]
   1. To do anything with animation and quickness, as to skip,
      fly, or hop. [Prov. Eng.] --Wordsworth.
      [1913 Webster]

   2. To sing cheerfully. [Scot.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lilt \Lilt\, v. t.
   To utter with spirit, animation, or gayety; to sing with
   spirit and liveliness.
   [1913 Webster]

         A classic lecture, rich in sentiment,
         With scraps of thundrous epic lilted out
         By violet-hooded doctors.                --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lilt \Lilt\, n.
   1. Animated, brisk motion; spirited rhythm; sprightliness.
      [1913 Webster]

            The movement, the lilt, and the subtle charm of the
            verse.                                --F. Harrison.
      [1913 Webster]

   2. A lively song or dance; a cheerful tune.
      [1913 Webster]

            The housewife went about her work, or spun at her
            wheel, with a lilt upon her lips.     --J. C.
                                                  Shairp.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lilt
    n 1: a jaunty rhythm in music [syn: lilt, swing]
    v 1: articulate in a very careful and rhythmic way

Moby Thesaurus II by Grady Ward, 1.0:

239 Moby Thesaurus words for "lilt":
   Alexandrine, Brautlied, Christmas carol, Kunstlied, Liebeslied,
   Volkslied, accent, accentuation, alba, amphibrach, amphimacer,
   anacrusis, anapest, anthem, antispast, arsis, art song, aubade,
   bacchius, ballad, ballade, ballata, barcarole, bark, bawl, beam,
   beat, bellow, blare, blat, blubber, blues, blues song, boat song,
   boom, bray, breathe, bridal hymn, brindisi, buzz, cackle, cadence,
   caesura, calypso, canso, canticle, canzone, canzonet, canzonetta,
   caper, caracole, carol, catalexis, cavatina, chanson, chant,
   chantey, chirp, chirrup, chloriamb, chloriambus, choir, chorus,
   clap hands, colon, coo, counterpoint, cretic, croon, croon song,
   crow, dactyl, dactylic hexameter, dance, delight, descant,
   diaeresis, dimeter, dipody, dirge, ditty, do-re-mi, dochmiac,
   drawl, drinking song, elegiac, elegiac couplet, elegiac pentameter,
   emphasis, epithalamium, epitrite, exclaim, exult, feminine caesura,
   flute, folk song, foot, frisk, frolic, gambol, gasp, glory, glow,
   growl, grunt, heptameter, heptapody, heroic couplet, hexameter,
   hexapody, hiss, hum, hymeneal, hymn, iamb, iambic,
   iambic pentameter, ictus, intonate, intone, ionic, jingle, joy,
   jubilate, keen, laugh, lay, lied, love song, love-lilt,
   masculine caesura, matin, measure, meter, metrical accent,
   metrical foot, metrical group, metrical unit, metrics, metron,
   minstrel, minstrel song, minstrelsy, molossus, mora, movement,
   mumble, murmur, mutter, national anthem, number, numbers, paeon,
   pant, pentameter, pentapody, period, pipe, proceleusmatic, prosody,
   prothalamium, psalm, pyrrhic, quantity, quaver, radiate cheer,
   rejoice, revel, rhythm, rhythmic pattern, roar, rollick, romp,
   roulade, rumble, scream, screech, serena, serenade, serenata,
   shake, shriek, sibilate, sigh, sing, sing in chorus, skip,
   skip for joy, smile, snap, snarl, snort, sob, sol-fa, solmizate,
   song, sparkle, spondee, sprung rhythm, squall, squawk, squeal,
   stress, swing, syzygy, tetrameter, tetrapody, tetraseme,
   theme song, thesis, thunder, torch song, tremolo, tribrach, trill,
   trimeter, tripody, triseme, trochee, troll, trumpet, twang,
   tweedle, tweedledee, twit, twitter, vocalize, wail, war song,
   warble, wedding song, whine, whisper, whistle, yap, yawp, yell,
   yelp, yodel