Definition of “adopt” - Learner’s Dictionary

adopt

verb uk us /əˈdɒpt/
CHILD [ I, T ]

B2 to legally become the parents of someone else's child

START USING [ T ]

B2 to accept or start using something new:

We've adopted a new approach.
adopted adjective

B2

an adopted son
adoption uk us /əˈdɒpʃən/ noun [ C, U ]

(Definition of “adopt” from the Cambridge Learner's Dictionary © Cambridge University Press)