OPERATIONAL

\ˌɒpəɹˈe͡ɪʃənə͡l], \ˌɒpəɹˈe‍ɪʃənə‍l], \ˌɒ_p_ə_ɹ_ˈeɪ_ʃ_ə_n_əl]\
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2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2006 - WordNet 3.0
By Princeton University