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.
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   2. To sing cheerfully. [Scot.]
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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.
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         A classic lecture, rich in sentiment,
         With scraps of thundrous epic lilted out
         By violet-hooded doctors.                --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

Lilt \Lilt\, n.
   1. Animated, brisk motion; spirited rhythm; sprightliness.
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            The movement, the lilt, and the subtle charm of the
            verse.                                --F. Harrison.
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   2. A lively song or dance; a cheerful tune.
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            The housewife went about her work, or spun at her
            wheel, with a lilt upon her lips.     --J. C.
                                                  Shairp.
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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