Source : Webster's Revised Unabridged Dictionary (1913)

Accidence \Ac"ci*dence\, n. [A corruption of Eng. accidents, pl.
   of accident. See {Accident}, 2.]
   1. The accidents, of inflections of words; the rudiments of
      grammar. --Milton.

   2. The rudiments of any subject. --Lowell.

Source : WordNet®

accidence
     n : the part of grammar that deals with the inflections of words
         [syn: {inflectional morphology}]