American Heritage Dictionary
(5)
Century Dictionary
(7)
GNU Webster's 1913
(3)
WordNet
(3)
Elsewhere on the web
Once multiple servers have been turned into a cluster, the individual servers in the cluster are monitored by one another using a "heartbeat."— TechNet Blogs
Hence joining the cluster is as simple as opening a URL and distribution is handled by our battle-tested HTTP protocol. programming— RubyCorner
Dr. Torrens said that using techniques from the field, he could associate samples together, determining whether a cluster was legitimately such, or an abberration in the data -- "whether a cluster is a cluster," in other words.— Wi-Fi Networking News
Workers in a cluster are also more likely to be well-trained and more skilled, since it's a local industry of a certain geographical area and everyone in that area is likely to know how the industry operates and have a good general knowledge of it.

American Heritage Dictionary (1)
Century Dictionary (2)
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