Etymology
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aerobics (n.)

method of exercise and a fad in early 1980s, American English, coined 1968 by U.S. physician Kenneth H. Cooper (b. 1931), from aerobic (also see -ics) on the notion of activities which require modest oxygen intake and thus can be maintained.

updated on November 12, 2016

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Definitions of aerobics from WordNet

aerobics (n.)
exercise that increases the need for oxygen;
Synonyms: aerobic exercise
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.