Static Key Pair definition in Computer Security terms:
Definition(s): A key pair, consisting of a private key (i.e., a static private key) and a public key (i.e., a static public key) that is intended for use for a relatively long period of time and is typically intended for use in multiple key establishment transactions. Contrast with an ephemeral key pair.
Source(s): NIST SP 800-56A Rev. 2
reference: CSRC Glossary