OSI

Proper noun

 * 1)   An International Standard ISO/IEC 7894:1994(E) subtitled Basic Reference Model. A four-part document that contains a formal description of an idealized computer network architecture. The document is also published as ITU-T Recommendation X.200
 * 2)   A message sent to an airline by an agent, in a standardised format, advising relevant information such as being a VIP, language difficulty, or passport information.

Derived terms

 * OSI layer
 * OSI model