assimilationist adjective 1noun 1forms 3 adjective1 •Of or pertaining to assimilationism; promoting or advocating assimilationism.Shortly after Chiang Kaishek came to power, however, the GMD^([Guomindang]) once again withdrew its support for self-determination and pursued a more assimilationist strategy. — 2000 noun1 •An advocate of the policy or practice of the assimilation of immigrant or other minority cultures into a mainstream culture.Spanish-language education is not favored by assimilationist parents of Latino children in the US. formsassimilationists · more assimilationist · most assimilationist