The Collaborative International Dictionary of English v.0.48:

Feasible \Fea"si*ble\ (f[=e]"z[i^]*b'l) a. [F. faisable, fr.
   faire to make or do, fr. L. facere. See Fact, Feat.]
   1. Capable of being done, executed, or effected; practicable.
      [1913 Webster]

            Always existing before their eyes as a thing
            feasible in practice.                 --Burke.
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            It was not feasible to gratify so many ambitions.
                                                  --Beaconsfield.
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   2. Fit to be used or tilled, as land. [R.] --R. Trumbull.
      Fea"si*ble*ness, n. --Fea"si*bly, adv.
      [1913 Webster]

WordNet (r) 3.0 (2006):

feasibleness
    n 1: the quality of being doable [syn: feasibility,
         feasibleness] [ant: infeasibility, unfeasibility]