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

Normalized population density for word "spectra" throughout decades:

1880s : 3.1341
1890s : 5.2175
1900s : 5.5975
1910s : 1.7905
1920s : 4.2823
1930s : 2.4054
1940s : 0.2691
1950s : 0.4481
1960s : 0.8714
1970s : 0.4927
1980s : 0.6277
1990s : 0.2006
2000s : 0.0958