American Heritage Dictionary
(6)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
I agree with the gist of your comment (it most definitely is anything but linear), but regarding the suitable metric, growing degree hours, where hourly data are either available or interpolate-able, should do what you want.— RealClimate
My photos are already 10mpixel, is it still neccesary to interpolate it?— Digital Camera Reviews & Photography Tips
The persistence-of-vision hurdle is easily jumped, by tuning a decay function to interpolate across the animated gif so that it looks like the appropriate single frame.— Slashdot
(© Gerry Goodstein) "When you're fat and ugly, you had better have a couple of high F's you can interpolate into your life."— TheaterMania.com
It should have an interpolation technique (linear should be easy enough) to interpolate missing positions between 2 known positions.— MacUpdate - Mac OS X

American Heritage Dictionary (1)
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 about twice a year.
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