Another industry term for this is defined in the Domain Driven Design world as a domain's "ubiquitous language"[0]:

  These aspects of domain-driven design aim to foster a 
  common language shared by domain experts, users, and 
  developers—the ubiquitous language. The ubiquitous language 
  is used in the domain model and for describing system 
  requirements.

0 - https://en.wikipedia.org/wiki/Domain-driven_design#Overview