The Collaborative International Dictionary of English v.0.48:

Jagger \Jag"ger\ (j[a^]g"g[~e]r), n.
   One who carries about a small load; a peddler. See 2d Jag.
   [Scot.] --Sir W. Scott.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jagger \Jag"ger\, n. [From 4th Jag.]
   One who, or that which, jags; specifically:
   (a) a jagging iron used for crimping pies, cakes, etc.
   (b) A toothed chisel. See Jag, v. t.
       [1913 Webster]

   Jagger spring, a spring beneath a seat, and resting on
      cleats or blocks in the body of a vehicle. --Knight.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Jagger
    n 1: English rock star (born in 1943) [syn: Jagger, Mick
         Jagger, Michael Philip Jagger]