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Word: biennial (lookup in dictionary) (lookup stats)
Dates: during 1960-1969
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Word Time Machine

Normalized population density for word "biennial" throughout decades:

1880s : 0.5743
1890s : 5.0007
1910s : 0.3645
1920s : 1.2717
1930s : 1.8450
1940s : 1.0057
1950s : 1.3466
1960s : 0.9580
1970s : 0.7640
1980s : 0.7188
1990s : 0.6126
2000s : 0.7230
2010s : 0.5215