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adopt (v.)

c. 1500, a back-formation from adoption or else from Old French adopter (14c.) or directly from Latin adoptare "chose for oneself, take by choice, select, adopt," especially "to take into a family, adopt as a child," from ad "to" (see ad-) + optare "choose, wish, desire" (see option (n.)). Originally in English also of friends, fathers, citizens, etc. Sense of "to legally take as one's own child" and that of "to embrace, espouse" a practice, method, etc. are from c. 1600. Related: Adopted; adopting.

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Definitions of adopt from WordNet

adopt (v.)
choose and follow; as of theories, ideas, policies, strategies or plans;
Synonyms: follow / espouse
adopt (v.)
take up and practice as one's own;
Synonyms: borrow / take over / take up
adopt (v.)
take on titles, offices, duties, responsibilities;
Synonyms: assume / take on / take over
adopt (v.)
take on a certain form, attribute, or aspect;
he adopted an air of superiority
Synonyms: assume / acquire / take on / take
adopt (v.)
take into one's family;
They adopted two children from Nicaragua
Synonyms: take in
adopt (v.)
put into dramatic form;
adopt a book for a screenplay
Synonyms: dramatize / dramatise
adopt (v.)
take up the cause, ideology, practice, method, of someone and use it as one's own;
They adopted the Jewish faith
Synonyms: espouse / embrace / sweep up
From wordnet.princeton.edu