American Heritage Dictionary
(3)
Century Dictionary
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
The Military hasn't allowed it to go super-sonic, (the B2 is only rated as sub-sonic), but it could, according to Dr. Paul LaViolette, sorry no vertical take off capabilites, yet!!— Technology Review RSS Feeds
(RAF???) planes produced sonic-boom level noise over St Kilda, Prahran and South Yarra at intervals from Friday to Sunday.— Crikey » Canberra Calling
Far Flung's sounds could be described (if needed ....) as experimental psychedelic - sonic spaces.— AvaxHome RSS:
It was like a sonic boom -- only the sound wasn't coming from the airport.— CNN.com

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 month.
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