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Words getting along nicely ....
Word: sigma (lookup in dictionary) (lookup stats) Dates: during 1980-1989 Sort By: most recent first (reverse)
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Normalized population density for word "sigma" throughout decades:
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Word "sigma" first appeared in our records from 1877!
See usage in 1877 »
The following words have supported "sigma" in appearing on this page. Do you know these words: