MICROSECOND

\mˈa͡ɪkɹə͡ʊsˌɛkənd], \mˈa‍ɪkɹə‍ʊsˌɛkənd], \m_ˈaɪ_k_ɹ_əʊ_s_ˌɛ_k_ə_n_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd