WordReference Random House Learner's Dictionary of American English © 2019
aer•o•bics /ɛəˈroʊbɪks/USA pronunciation   n. 
    any of various exercises, as jogging and calisthenics, that stimulate and strengthen the heart: [noncount;
    used with a singular verb
    ]:Aerobics is a good way to lose weight.[plural;
    used with a plural verb
    ]:The aerobics were fairly strenuous.

adj. [before a noun] of or relating to aerobics:aerobics classes.

WordReference Random House Unabridged Dictionary of American English © 2019
aer•o•bics  (â rōbiks),USA pronunciation n. 
  1. SportAlso called  aerobic exercises. (used with a pl. v.) any of various sustained exercises, as jogging, rowing, swimming, or cycling, that stimulate and strengthen the heart and lungs, thereby improving the body's utilization of oxygen.
  2. Sport(used with a sing. v.) a physical fitness program based on such exercises:Aerobics is a good way to get your body in shape.
[1965–70;
see aerobic, -ics;
prob. shortened from aerobic exercises on the model of calisthenics]


Collins Concise English Dictionary © HarperCollins Publishers::

aerobics /ɛəˈrəʊbɪks/ n
  1. (functioning as singular) any system of sustained exercises designed to increase the amount of oxygen in the blood and strengthen the heart and lungs



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