Source : Webster's Revised Unabridged Dictionary (1913)

Pant \Pant\, 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.

            Pluto plants for breath from out his cell. --Dryden.

   2. Hence: To long eagerly; to desire earnestly.

            As the hart panteth after the water brooks. --Ps.
                                                  xlii. 1.

            Who pants for glory finds but short repose. --Pope.

   3. To beat with unnatural violence or rapidity; to palpitate,
      or throb; -- said of the heart. --Spenser.

   4. To sigh; to flutter; to languish. [Poetic]

            The whispering breeze Pants on the leaves, and dies
            upon the trees.                       --Pope.

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

            There is a cavern where my spirit Was panted forth
            in anguish.                           --Shelley.

   2. To long for; to be eager after. [R.]

            Then shall our hearts pant thee.      --Herbert.

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

   2. A violent palpitation of the heart. --Shak.

Source : WordNet®

pant
     n 1: the noise made by a short puff of steam (as from an engine)
     2: 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: {puff},
          {gasp}, {heave}]
     2: utter while panting, as if out of breath