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Word: rigorous (lookup in dictionary) (lookup stats)
Dates: during 1900-1909
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Word Time Machine

Normalized population density for word "rigorous" throughout decades:

1870s : 0.2926
1880s : 0.2555
1890s : 0.0881
1900s : 0.1282
1910s : 0.4191
1920s : 0.6610
1930s : 0.5647
1940s : 0.5810
1950s : 0.6805
1960s : 0.9470
1970s : 1.1545
1980s : 1.1363
1990s : 1.2414
2000s : 1.5131
2010s : 1.9570