Etymology
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adoption (n.)

mid-14c., adopcioun, "action of taking (a child) as one's own; condition of being adopted," from Old French adopcion or directly from Late Latin adoptionem (nominative adoptio) "a taking as one's child," shorter form of adoptatio, noun of action from past-participle stem of 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" (from PIE root *op- (2) "to choose;" see option (n.)).

updated on September 15, 2022

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Definitions of adoption from WordNet

adoption (n.)
the act of accepting with approval; favorable reception;
its adoption by society
Synonyms: acceptance / acceptation / espousal
adoption (n.)
a legal proceeding that creates a parent-child relation between persons not related by blood; the adopted child is entitled to all privileges belonging to a natural child of the adoptive parents (including the right to inherit);
adoption (n.)
the appropriation (of ideas or words etc) from another source;
Synonyms: borrowing
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.