📖 Biblical Definition
Adoption is the legal act by which a man takes another's child as his own with full rights of family and inheritance. Paul makes it one of the central New Testament images for salvation: the saint is adopted into the family of God, given the Spirit of adoption, whereby we cry, Abba, Father, and made joint-heir with Christ. Adoption ranks with justification as a foundational New Testament doctrine.
📜 Webster 1828 Definition
The act of taking another's child as one's own with full family rights; in Scripture, the saint received into God's family.
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ADOPTION, n. The act of adopting, or the state of being adopted; the taking and treating of a stranger as one's own child.
Roman law gave adoption a sharper legal status than modern adoption: the adopted son was as much heir as the natural son, and could not be disinherited. Paul deploys the Roman picture in Galatians 4 and Romans 8.
📖 Key Scripture
Romans 8:15 — "For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father."
Romans 8:17 — "And if children, then heirs; heirs of God, and joint-heirs with Christ."
Galatians 4:5 — "To redeem them that were under the law, that we might receive the adoption of sons."
Ephesians 1:5 — "Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will."
⚠️ Modern Corruption
Modern Christianity often defaults to forensic vocabulary (justified, declared righteous) and underplays adoption (made son, given inheritance). Scripture pairs them.
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Justification answers am I right with God?; adoption answers am I in His family?. Both are needed. The legal acquittal without the family welcome leaves the saint pardoned but homeless. The household welcome without the legal acquittal is sentimental but unstable. Scripture gives both at once.
Romans 8:15's Abba, Father is the inner work of adoption. The Spirit Himself bears witness with our spirit that we are children of God. The cry from the heart matches the legal status: the household is real, the inheritance is real, the Father is real.
🔗 Greek & Hebrew Roots
Greek huiothesia (literally ‘son-placing’) is Paul's term.
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Greek huiothesia — adoption as son; the placing of one as son.
Note: appears five times in Paul, never elsewhere in the New Testament; a distinctively Pauline doctrine.
Usage
"Justification: am I right with God? Adoption: am I in His family?"
"Both are needed; Scripture gives both."
"The Spirit of adoption cries Abba, Father — from the inside."