What is the meaning of Adoption?

The act of adopting. (Can we add an example for this sense?)

The state of being adopted; the acceptance of a child of other parents as if he or she were one's own child.

Admission to an institution, for example a hospital, clinic, mental asylum.

The choosing and making that to be one's own which originally was not so; acceptance

Transfer between an old system to another (usually better) system.

An act of divine grace by which the redeemed in Christ are admitted to the privileges of the sons of God.

Ten consecutive wins against an opponent.

genitive singular of adoptio

adoption

adoption

Source: wiktionary.org