American Heritage Dictionary
(3)
Century Dictionary
(2)
GNU Webster's 1913
(2)
WordNet
(2)
Elsewhere on the web
To overcome a Republican filibuster, the Democrats would need to amass 60 votes to shut down debate and force a vote.— The Daily Star > News Feed
After all, wouldn't Warren Buffett have to be some sort of rumpled, steak-loving demigod to amass his mind-boggling wealth?— Fool.com: The Motley Fool
In the online world, it's much easier to amass some crazy numbers.
But he wants to exploit their recklessness to amass his own fortune.— Forbes.com: News
Also aiding the need to amass all necessarily information are several rewards being offered for good tips.— independent.com stories

American Heritage Dictionary (1)
Century Dictionary (2)
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 several times a year.
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