acculturation by Merriam Webster

noun ac·​cul·​tur·​a·​tion | \ ə-ˌkəl-chə-ˈrā-shən  , a-\

Definition of acculturation

1: cultural modification of an individual, group, or people by adapting to or borrowing traits from another culture the acculturation of immigrants to American life also: a merging of cultures as a result of prolonged contact

2: the process by which a human being acquires the culture of a particular society from infancy