In reinsurance this term is applied to the nouns: insurer, insured, policy and insurance and means respectively: (1) the insurance company which initially originates the business, i e , the ceding company; (2) the policyholder insured by the primary insurer; (3) the initial policy issued by the primary insurer to the primary insured; (4) the insurance covered under the primary policy issued by the primary insurer to the primary insured (sometimes called "underlying insurance")
The first part of a Kerberos principal The identification of who (or what) owns the specified set of Kerberos credentials Users, services, and hosts all have Kerberos credentials; the primary may be a username, the name of a service, or the name of a host
the first part of a Kerberos principal In the case of a user, it is the username In the case of a service, it is the name of the service
coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit; "current through the primary coil induces current in the secondary coil"