American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
MHz Megahertz -- international unit for megacycle.— The Dawn of Amateur Radio in the U.K. and Greece: a personal view
Beyond the free right now, it'll supposedly be priced by the CPU megacycle as opposed to "instance" that's running, so it can be much more fine-grained than Amazon.— Roger A. Grimes's blog

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