American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
Year-round sports have made the three-sport athlete a rarity, along with any semblance of an offseason.— The Seattle Times
But MP3 players and expandable memory were a rarity, and even Bluetooth took some time to become accepted as a standard.— Mobile Gazette
But there's one item that is still something of a rarity -- and no, I'm not talking about the expertise needed to run it.— ZDNET.com.au

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 month.
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