assimilativeness
/əˈsɪmɪlətɪvnɪs/noun
1The quality of being assimilative; capacity for assimilation; specifically the ease with which one culture assimilates something from another culture, or the extent to which integration with another (especially dominant) social, racial, or cultural group is or may be achieved.
2 Biology. The capacity of a nutrient to be assimilated; the efficiency with which a food is assimilated. rare.
Origin
Mid 19th century. From assimilative + -ness.