American Heritage Dictionary
(3)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(5)
Elsewhere on the web
The phytoplankton productivity of the North Sea and oxygen exchange between surface and deep waters are both sensitive to changes in timing and extent with water column stratification, and this is predicted to increase with global warming.— Naturejobs - All Jobs
The resulting stratification has been applied to the whole global GBA2000 dataset, and preliminary validation results are reported for Africa.— CiteULike: Everyone's library
In human studies, an analogous issue is population stratification, which is a great concern.— PLoS ONE Alerts: New Articles
Even beyond the price tag, the new stadium creates a social stratification which is anathema to anyone who believes that ballparks are some of our last great shared public spaces.— Baseball Prospectus
The archaeologists rapidly gave up trying to establish any kind of stratification, they'd arrived years too late, possibly centuries.— A Corner of Tenth-Century Europe

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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