The Collaborative International Dictionary of English v.0.48:

Pant \Pant\ (p[.a]nt), v. i. [imp. & p. p. Panted; p. pr. &
   vb. n. Panting.] [Cf. F. panteler to gasp for breath, OF.
   panteisier to be breathless, F. pantois out of breath; perh.
   akin to E. phantom, the verb prob. orig. meaning, to have the
   nightmare.]
   1. To breathe quickly or in a labored manner, as after
      exertion or from eagerness or excitement; to respire with
      heaving of the breast; to gasp.
      [1913 Webster]

            Pluto plants for breath from out his cell. --Dryden.
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   2. Hence: To long eagerly; to desire earnestly; -- often used
      with for or after.
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            As the hart panteth after the water brooks. --Ps.
                                                  xlii. 1.
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            Who pants for glory finds but short repose. --Pope.
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   3. To beat with unnatural violence or rapidity; to palpitate,
      or throb; -- said of the heart. --Spenser.
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   4. To sigh; to flutter; to languish. [Poetic]
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            The whispering breeze
            Pants on the leaves, and dies upon the trees.
                                                  --Pope.
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The Collaborative International Dictionary of English v.0.48:

Pant \Pant\, v. t.
   1. To breathe forth quickly or in a labored manner; to gasp
      out.
      [1913 Webster]

            There is a cavern where my spirit
            Was panted forth in anguish.          --Shelley.
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   2. To long for; to be eager after. [R.]
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            Then shall our hearts pant thee.      --Herbert.
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The Collaborative International Dictionary of English v.0.48:

Pant \Pant\, n.
   1. A quick breathing; a catching of the breath; a gasp.
      --Drayton.
      [1913 Webster]

   2. A violent palpitation of the heart. --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

pant \pant\, n.
   A single leg of a pair of pants. See pants.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

pant \pant\, a.
   Of or pertaining to pants.
   [PJC]

WordNet (r) 3.0 (2006):

pant
    n 1: the noise made by a short puff of steam (as from an engine)
    2: (usually in the plural) a garment extending from the waist to
       the knee or ankle, covering each leg separately; "he had a
       sharp crease in his trousers" [syn: trouser, pant]
    3: a short labored intake of breath with the mouth open; "she
       gave a gasp and fainted" [syn: gasp, pant]
    v 1: breathe noisily, as when one is exhausted; "The runners
         reached the finish line, panting heavily" [syn: pant,
         puff, gasp, heave]
    2: utter while panting, as if out of breath