ALL AT ONCE

\ˈɔːl ɐtwˈɒns], \ˈɔːl ɐtwˈɒns], \ˈɔː_l ɐ_t__w_ˈɒ_n_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd