Source : Webster's Revised Unabridged Dictionary (1913)

Syncretism \Syn"cre*tism\, n. (Philol.)
   The union or fusion into one of two or more originally
   different inflectional forms, as of two cases.

Syncretism \Syn"cre*tism\, n. [Gr. ?, fr. ? to make two parties
   join against a third: cf. F. syncr['e]tisme.]
   Attempted union of principles or parties irreconcilably at
   variance with each other.

         He is plotting a carnal syncretism, and attempting the
         reconcilement of Christ and Belial.      --Baxter.

         Syncretism is opposed to eclecticism in philosophy.
                                                  --Krauth-Fleming.

Source : WordNet®

syncretism
     n 1: the union (or attempted fusion) of different systems of
          thought or belief (especially in religion or
          philosophy); "a syncretism of material and immaterial
          theories"
     2: the fusion of originally different inflected forms
        (resulting in a reduction in the use of inflections)