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Word: certification (lookup in dictionary) (lookup stats)
Dates: during 1880-1889
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Word Time Machine

Normalized population density for word "certification" throughout decades:

1880s : 0.0660
1890s : 0.0591
1910s : 0.3518
1920s : 0.2611
1930s : 0.2803
1940s : 0.0793
1950s : 0.3566
1960s : 0.6605
1970s : 0.9943
1980s : 1.5725
1990s : 1.4289
2000s : 1.8969
2010s : 1.2584