Acculturation is defined as –
Acculturation 

Acculturation means "Culture contact", when there is contact between two peoples with different types of culture. There is diffusion of culture in both ways.
Various ways of culture contact are :
Trade and commerce
Industrialization
Propagation of religion
Education
Conquest
Loss of culture sense
Isolation of two cultures
Fading away of culture
Mixing of two cultures when coming in contact