American Heritage Dictionary
(3)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
"It is not new that in such forums there is always an attempt to reach of the lowest common denominator which is Israel bashing," he said in Jerusalem.— Winds Of Jihad By SheikYerMami
The end result of all this is what finally shipped: the lowest common denominator, the simplest and least controversial option.— Valhalla Island
There is a common denominator, which is the decline of the profession of journalism, the rise of news as entertainment, and the Stockholm Syndrome of media, in which far too much of the press become prisoners of those they cover, creating insider clubs from which the vast majority of Americans are excluded.— The Smirking Chimp - News And Commentary from the Vast Left-Wing Conspiracy
"The Treasurer says it's the best practice in Australia; it's the best practice of the lowest common denominator, and whether it's even that, well, you'd have to wait for the detail," said Ms Law.— Latest News - Yahoo!7 News
Through disparate calls to action, however, the common denominator was anger at America's trajectory and a desire to change it.

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 month.
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