IPA: /əˈdɒpʃənɪzəm/
KK: /əˈdɑpʃənˌɪzəm/
A belief that Jesus became the Son of God at a certain point in his life, rather than being divine from birth.
Adoptionism is a theological belief that has been debated throughout Christian history.
Adoptionism → It is formed from "adoptio" (from Latin, meaning the act of adopting) and "-ism" (a suffix used to denote a doctrine or belief). The term "adoptionism" refers to the belief that Jesus was adopted as the Son of God, rather than being divine by nature.
Think of the act of 'adopting' ('adoptio') someone into a family, which helps you remember that 'adoptionism' is about the belief in Jesus being adopted as the Son of God.