Any process that activates or increases the frequency, rate or extent of endodermal cell differentiation.
Synonyms:
exact_synonym:
positive regulation of endoderm cell differentiation; up regulation of endoderm cell differentiation; up regulation of endodermal cell differentiation; upregulation of endoderm cell differentiation; upregulation of endodermal cell differentiation
narrow_synonym:
activation of endoderm cell differentiation; activation of endodermal cell differentiation