MIGHTFUL
\mˈa͡ɪtfə͡l], \mˈaɪtfəl], \m_ˈaɪ_t_f_əl]\
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2006
- WordNet 3.0
By Princeton University
1919
- The Concise Standard Dictionary of the English Language
By James Champlin Fernald
2010
- New Age Dictionary Database
By Oddity Software
1913
- Webster's Revised Unabridged Dictionary
By Noah Webster.