What is the meaning of adopt?

verb

• Choose and follow; as of theories, ideas, policies, strategies or plans.
  • usage: "She followed the feminist movement"; "The candidate espouses Republican ideals"
  • synonyms: follow, espouse
• Take up and practice as one's own.
  • synonyms: borrow, take over, take up
• Take on titles, offices, duties, responsibilities.
  • usage: "When will the new President assume office"
  • synonyms: assume, take on, take over
• Take on a certain form, attribute, or aspect.
  • usage: "His voice took on a sad tone"; "The story took a new turn"; "he adopted an air of superiority"; "She assumed strange manners"; "The gods assume human or animal form in these fables"
  • synonyms: assume, acquire, take on, take
• Take into one's family.
  • usage: "They adopted two children from Nicaragua"
  • synonyms: take in
• Put into dramatic form.
  • usage: "adopt a book for a screenplay"
  • synonyms: dramatize, dramatise
• Take up the cause, ideology, practice, method, of someone and use it as one's own.
  • usage: "She embraced Catholicism"; "They adopted the Jewish faith"
  • synonyms: espouse, embrace, sweep up