Gini index
n.— «The Census Bureau measures income disparity through an established method called the Gini index—named after Italian statistician Corrado Gini. The index measures the gap among incomes of all households.» —“Income gap closes in rural suburbs, Census says” by Haya El Nasser, Paul Overberg USA Today Sept. 13, 2007. (source: Double-Tongued Dictionary)
Further reading
A magnificent new book celebrates the richness and diversity of 450 years of written and spoken English in what is now the United States. It’s called The People’s Tongue, and it’s a sumptuous collection of essays, letters, poems...
Mackenzie from Green Bay, Wisconsin, learned the word agita from a friend in Bethlehem, Pennsylvania. She uses it to refer to “that heavy, sluggish feeling one gets after eating too much,” the feeling some call the meat sweats. The word agita comes...