4d316111_ing_Kerberos__Support____Cisco_Table_1_Kerberos_Terminology_Definition
[Term] principal [Definition] 
Also known as a Kerberos identity, this is who you are or what a service is according to the Kerberos server.
User Security Configuration Guide, Cisco IOS XE Release 3S - Configuring Kerberos [Support] - Cisco