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Open System ['əupən'sɪstɪm]
comp., abbr.	OS
Open Systems
abbr., mil., commer.	OS
open system ['əupən'sɪstɪm]
IT	A model for the design of a network. The open systems interconnect OSI model defines groups of functionality required to network computers into layers. Each layer implements a standard protocol to implement its functionality. There are seven layers in the OSI model.

open systems: 2 phrases in 1 subject

Abbreviation

2