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The Collaborative International Dictionary
Adrogation

Adrogation \Ad`ro*ga"tion\, n. [L. adrogatio, arrogatio, fr. adrogare. See Arrogate.] (Rom. Law) A kind of adoption in ancient Rome. See Arrogation.

Wiktionary
adrogation

n. A kind of adoption in Ancient Rome.

Wikipedia
Adrogation

Adrogation, among ancient Romans, was a kind of adoption in which the person adopted was free, and consented to be adopted by another. It was done at the assembly of the people while the commonwealth subsisted, and later by a rescript of the emperors.

This is contrasted with arrogation, in which one claims another for oneself without the right.

Category:Roman law