EXPERIMENTATIVE

\ɛkspˌɛɹɪmˈɛntətˌɪv], \ɛkspˌɛɹɪmˈɛntətˌɪv], \ɛ_k_s_p_ˌɛ_ɹ_ɪ_m_ˈɛ_n_t_ə_t_ˌɪ_v]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.