Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym OS is...

OS is

Overhead Sending
Online Services
Open Server

More Meanings For OS:

Operating System
Operating System
Optimize For Size
Open Source
Open System
Overhead Sending
Online Services
Open Server
Operating System
Open Source
Open Sockets
Operating System
Operations System
Orzya Sativa
Osmium

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