/ əˌsɪməˈleɪʃn; NAmE / noun
1.
[ U ] the act of assimilating sb or sth, or being assimilated :
the rapid assimilation of new ideas
his assimilation into the community
2.
[ U , C ] ( phonetics ) the act of making two sounds in speech that are next to each other more similar to each other in certain ways, for example the pronunciation of the /t/ in football as a /p/ ; an example of this