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

Normalized population density for word "perturbation" throughout decades:

1880s : 0.7938
1920s : 2.6180
1930s : 3.7687
1950s : 0.7944
1960s : 0.8828
1970s : 1.0752
1980s : 0.1391
1990s : 0.5928
2000s : 0.4075