SIXTHLY
\sˈɪksθli], \sˈɪksθli], \s_ˈɪ_k_s_θ_l_i]\
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2006
- WordNet 3.0
By Princeton University
2011
- English Dictionary Database
By DataStellar Co., Ltd
2010
- New Age Dictionary Database
By Oddity Software
1913
- Webster's Revised Unabridged Dictionary
By Noah Webster.
1899
- The american dictionary of the english language.
By Daniel Lyons
1919
- The concise Oxford dictionary of current English
By Sir Augustus Henry