American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
One thing the WAC could do is disallow scheduling games outside of the league in October and November; it causes a ripple effect of complications.— Starbulletin Headlines
This will quickly open the entire ebola research sector in all collaborating countries and disallow any patenting.— Linux Journal - The Original Magazine of the Linux Community
I have seen quite a few sites go down some because of server issues, others because they forgot to pay a hosting bill, others they accidentially disallow the entire site in robots. txt and I can't say most of these sites have risen above their previous positions.— Search Engine Roundtable

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 once a month.