The Collaborative International Dictionary of English v.0.48:

Jog \Jog\ (j[o^]g), v. t. [imp. & p. p. Jogged (j[o^]gd); p.
   pr. & vb. n. Jogging (j[o^]g"g[i^]ng).] [OE. joggen; cf. W.
   gogi to shake, and also E. shog, shock, v.]
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   1. To push or shake with the elbow or hand; to jostle; esp.,
      to push or touch, in order to give notice, to excite one's
      attention, or to warn.
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            Now leaps he upright, jogs me, and cries: Do you see
            Yonder well-favored youth?            --Donne.
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            Sudden I jogged Ulysses, who was laid
            Fast by my side.                      --Pope.
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   2. To suggest to; to notify; to remind; to call the attention
      of; as, to jog the memory.
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   3. To cause to jog; to drive at a jog, as a horse. See Jog,
      v. i.
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The Collaborative International Dictionary of English v.0.48:

Jogging \Jog"ging\, n.
   The act of giving a jog or jogs; traveling at a jog.
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WordNet (r) 3.0 (2006):

jogging
    n 1: running at a jog trot as a form of cardiopulmonary exercise