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operating system noun

  /ˈɑpəˌɹeɪtɪŋ ˌsɪstəm/ , /ˈɒpəˌɹeɪtɪŋ ˌsɪstəm/
  • (computing, software) Software for controlling the allocation and use of various hardware resources (memory, CPU time, disk space, input and output devices) to tasks and remote terminals.
 Betriebssystem
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