This article presents an expanded model of acculturation among international migrants and their descendants, proposing that acculturation is a multidimensional process involving the confluence of heritage and receiving cultural practices, values, and identifications. The authors discuss the implications of this reconceptualization for the acculturation construct and its relationship to psychosocial and health outcomes. They highlight the "immigrant paradox," where international migrants with more exposure to the receiving cultural context report poorer mental and physical health outcomes, and suggest that an expanded operationalization of acculturation is needed to address this paradox. The article also explores the roles of ethnicity, cultural similarity, and discrimination in the acculturation process, and introduces the concept of context of reception, which refers to how the receiving society constrains and directs the acculturation options available to migrants. The authors propose a new perspective on acculturation that integrates various streams of literature and aims to provide a fuller understanding of complex acculturation processes and their relationships to contextual and individual functioning.This article presents an expanded model of acculturation among international migrants and their descendants, proposing that acculturation is a multidimensional process involving the confluence of heritage and receiving cultural practices, values, and identifications. The authors discuss the implications of this reconceptualization for the acculturation construct and its relationship to psychosocial and health outcomes. They highlight the "immigrant paradox," where international migrants with more exposure to the receiving cultural context report poorer mental and physical health outcomes, and suggest that an expanded operationalization of acculturation is needed to address this paradox. The article also explores the roles of ethnicity, cultural similarity, and discrimination in the acculturation process, and introduces the concept of context of reception, which refers to how the receiving society constrains and directs the acculturation options available to migrants. The authors propose a new perspective on acculturation that integrates various streams of literature and aims to provide a fuller understanding of complex acculturation processes and their relationships to contextual and individual functioning.