OPERATING SYSTEM

\ˈɒpəɹˌe͡ɪtɪŋ sˈɪstəm], \ˈɒpəɹˌe‍ɪtɪŋ sˈɪstəm], \ˈɒ_p_ə_ɹ_ˌeɪ_t_ɪ_ŋ s_ˈɪ_s_t_ə_m]\

Definitions of OPERATING SYSTEM

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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd