<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>The relationship of the tooth in the jaw bone compared to the vertical position of zero degrees when viewed in an x-ray.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>