ARROGATION, civil law. Signifies nearly the same as adoption; the only difference between them is this, that adoption was of a person under full age but as arrogation required the person arrogated, sui juris, no one could be arrogated till he was of full age. Dig. 1, 7, 5; Inst. 1, 11, 3 1 Brown's Civ. Law, 119.