American Heritage Dictionary
(3)
Century Dictionary
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
As U2 officially drops its latest album -- "No Line on the Horizon" -- tomorrow, the Irish band is also implementing plans to take over the airwaves and newspapers with appearances slated every night this week on David Letterman and an early morning broadcast during Friday's— RVABlogs
For Chinese around the world, tomorrow is Chinese New Year eve; it is also the Korean (a Hybrid between Chinese and Japanese) New Year.— mirage.studio.7

American Heritage 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 day.