American Heritage Dictionary
(11)
Century Dictionary
(16)
GNU Webster's 1913
(4)
WordNet
(4)
Elsewhere on the web
This swarm, a sequence of earthquakes clustered in space and time, is occurring beneath the northern part of Yellowstone Lake in Yellowstone National Park.— Latest Articles
It depends on the number of people currently connected to a file, known as the swarm.— BBC News | Technology | World Edition
At the time of writing, though, the swarm was subsiding with no reports of such an event.— New Scientist - Earth

American Heritage Dictionary (2)
Century Dictionary (3)
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