Meaning of “os” in the English Dictionary

"OS" in American English

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OSnoun [ C ]

us /ˈoʊˌes/

abbreviation foroperating system

(Definition of “OS” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"OS" in Business English

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OSnoun

also O/S uk us

IT abbreviation for operating system

COMMERCE abbreviation for out of stock

ACCOUNTING abbreviation for outstanding

COMMERCE abbreviation for outsized

(Definition of “OS” from the Cambridge Business English Dictionary © Cambridge University Press)