American Heritage Dictionary
(7)
Century Dictionary
(18)
GNU Webster's 1913
(1)
WordNet
(6)
Elsewhere on the web
In normal times, our circulation has been a steady 20,000.— Environment news, comment and analysis | guardian.co.uk
If their circulation is audited, then their numbers are much more accurate than someone who simply tells you how many publications are printed and distributed.
I've also read that the ozone hole has had an effect on the Antarctic circulation, which is why Antarctica is the part of the globe that has warmed least [or not at all].— RealClimate
Varicose Veins can be very uncomfortable because of poor blood circulation which is caused by the varicose veins and it is advisable to have the varicose veins surgically removed to improve the circulation of blood in the effected areas.— MyLinkVault Newest Links

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 a few times a week.
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