RADIO-FREQUENCY SPECTRUM

\ɹˈe͡ɪdɪˌə͡ʊfɹˈiːkwənsi spˈɛktɹəm], \ɹˈe‍ɪdɪˌə‍ʊfɹˈiːkwənsi spˈɛktɹəm], \ɹ_ˈeɪ_d_ɪ__ˌəʊ_f_ɹ_ˈiː_k_w_ə_n_s_i s_p_ˈɛ_k_t_ɹ_ə_m]\

Definitions of RADIO-FREQUENCY SPECTRUM

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