OPERATIVE FIELD

\ˈɒpəɹətˌɪv fˈiːld], \ˈɒpəɹətˌɪv fˈiːld], \ˈɒ_p_ə_ɹ_ə_t_ˌɪ_v f_ˈiː_l_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd