agnatio
agnatio (ag-nay-shee-oh). [Latin] Roman law. Kinship through the male line, not necessarily involving blood ties; specif., an affiliation of free persons of either sex in the power (patria potestas) of the senior living male or of a male who would be in his power if he were living. • An agnatic relationship could be created either by adoption or by a blood relationship (cognatio) traced solely through the male side of a family. See COGNATIO; patria po-testas under POTESTAS.