1. to choose or take as one's own; make one's own by selection or assent: to adopt a nickname.
2. to take and rear (the child of other parents) as one's own child, specifically by a formal legal act.
3. to take or receive into any kind of new relationship: to adopt a person as a protégé.
4.to select as a basic or required textbook or series of textbooks in a course.5.to vote to accept: The House adopted the report.
I wanted to see what the formal definition of adoption is. I believe it is such a hard thing to simplify such a complicated act. To me adoption is opening your heart to letting your family grow in a little different way than the norm.