(networking) Initialism of Open Systems Interconnection. 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

(pathology) functional disease or condition such as hepatosis / process, action such as phagocytosis / formation, increase such as leukocytosis

(networking) Any of the seven layers of abstraction in the OSI model of communications systems

(networking) A description of the standard functions of a communications system in terms of seven layers of abstraction (the OSI layers).

plural of OSI layer

(computing, humorous) The user.

Of or relating to Andreas Osiander (1498–1552), German Lutheran theologian.

A surname.

plural of Osias