When there is exchange of culture traits and complexes, the process is known as Tansculturation.
Transculturation is a term coined by Cuban anthropologist Fernando Ortiz in 1947 to describe the phenomenon of merging and converging cultures.
Where attempts are made to keep a cultural identity "pure," the realities of social change, via natural and artificial means, dictate that cultures do not remain "pure" and never were "pure" in the first place, but are destined to change. It is the perception of individuals within cultures that their cultures do not in fact change fundamentally over time.