the republic established in France in 1870 and terminating with the Nazi occupation in 1940.
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British Dictionary definitions for third republic
the governmental system established after the fall of Napoleon III in the Franco-Prussian War and lasting until the German occupation of 1940
the period during which this governmental system functioned (1870–1940)
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