noun (usually used with a plural verb)
the period from March 20 to June 28, 1815, between the arrival of Napoleon in Paris, after his escape from Elba, and his abdication after the battle of Waterloo.
a special session of Congress from March 9, 1933 to June 16, 1933, called by President Franklin D. Roosevelt, in which important social legislation was enacted.
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Examples from the Web for hundred days
A single incident will put this hero and victim of the Hundred-Days into clear relief.The Two Brothers|Honore de Balzac
British Dictionary definitions for hundred days
French history the period between Napoleon Bonaparte's arrival in Paris from Elba on March 20, 1815, and his abdication on June 29, 1815
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012