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Word: proliferate (lookup in dictionary) (lookup stats)
Dates: during 1930-1939
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Word Time Machine

Normalized population density for word "proliferate" throughout decades:

1920s : 0.0631
1930s : 0.0956
1940s : 0.1380
1950s : 0.2681
1960s : 1.1706
1970s : 1.4905
1980s : 2.0121
1990s : 1.4290
2000s : 1.0806
2010s : 1.6221