Source : Webster's Revised Unabridged Dictionary (1913)

Floater \Float"er\ (Politics)
   (a) A voter who shifts from party to party, esp. one whose
       vote is purchasable. [U. S.]
   (b) A person, as a delegate to a convention or a member of a
       legislature, who represents an irregular constituency, as
       one formed by a union of the voters of two counties
       neither of which has a number sufficient to be allowed a
       (or an extra) representative of its own. [U. S.]
   (c) A person who votes illegally in various polling places or
       election districts, either under false registration made
       by himself or under the name of some properly registered
       person who has not already voted. [U. S.]

Floater \Float"er\, n.
   1. One who floats or swims.

   2. A float for indicating the height of a liquid surface.

Source : WordNet®

floater
     n 1: spots before the eyes caused by opaque cell fragments in the
          vitreous humor and lens [syn: {musca volitans}, {muscae
          volitantes}, {spots}]
     2: a debt instrument with a variable interest rate tied to some
        other interest rate (e.g. the rate paid by T-bills)
     3: a wanderer who has no established residence or visible means
        of support [syn: {vagrant}, {drifter}, {vagabond}]
     4: an employee who is reassigned from job to job as needed
     5: a voter who votes illegally at different polling places in
        the same election
     6: a swimmer who floats in the water
     7: an object that floats or is capable of floating
     8: an insurance policy covering loss of movable property (e.g.
        jewelry) regardless of its location [syn: {floating policy}]