INERTIAL FRAME

\ɪnˈɜːʃə͡l fɹˈe͡ɪm], \ɪnˈɜːʃə‍l fɹˈe‍ɪm], \ɪ_n_ˈɜː_ʃ_əl f_ɹ_ˈeɪ_m]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd