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1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.
 
1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.
 
  • Unconquerableness, insuperableness.
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan