The Collaborative International Dictionary of English v.0.48:

Incontinence \In*con"ti*nence\, Incontinency \In*con"ti*nen*cy\,
   n. [L. incontinentia: cf. F. incontinence.]
   [1913 Webster]
   1. Incapacity to hold; hence, incapacity to hold back or
      restrain; the quality or state of being incontinent; lack
      of continence; failure to restrain the passions or
      appetites; indulgence of lust; lewdness.
      [1913 Webster]

            That Satan tempt you not for your incontinency. --1
                                                  Cor. vii. 5.
      [1913 Webster]

            From the rash hand of bold incontinence. --Milton.
      [1913 Webster]

   2. (Med.) The inability of any of the animal organs to
      restrain the natural evacuations, especially urination, or
      defecation, so that the discharges are involuntary; as,
      incontinence of urine.
      [1913 Webster]

WordNet (r) 3.0 (2006):

incontinency
    n 1: involuntary urination or defecation [syn: incontinence,
         incontinency]