Syncretism
WordNet
noun
(1) The fusion of originally different inflected forms (resulting in a reduction in the use of inflections)
(2) The union (or attempted fusion) of different systems of thought or belief (especially in religion or philosophy)
"A syncretism of material and immaterial theories"
WiktionaryText
Noun
- The reconciliation or fusion of different systems or beliefs (or the attempt at such fusion)
- The fusion of different inflexional forms