Etymology
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megacycle (n.)

"one million cycles" (of oscillation), 1928, from mega- + cycle (n.). Often meaning "one million cycles per second."

updated on December 15, 2018

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Definitions of megacycle from WordNet

megacycle (n.)
one million periods per second;
Synonyms: megahertz / MHz / megacycle per second / Mc
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.