PREFERENTIALLY

\pɹˌɛfəɹˈɛnʃə͡lˌi], \pɹˌɛfəɹˈɛnʃə‍lˌi], \p_ɹ_ˌɛ_f_ə_ɹ_ˈɛ_n_ʃ_əl_ˌi]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd