/ˈʌdʌlt əˈdɒpʃən/ – Noun
Definition: Quá trình người lớn nhận nuôi người khác.
A more thorough explanation: the act of taking legal responsibility for another person’s natural child who is fully developed, no longer a child and legally responsible for his or her actions; the adoption of one adult by another adult
Example: Ms Holt went through an adult adoption at 37 when her stepfather formally became her father.