a. (Chem.) Pertaining to, or obtained from, terbenthene (oil of turpentine); specifically, designating an acid, C7H10O4, obtained by the oxidation of terbenthene with nitric acid, as a white crystalline substance. [ 1913 Webster ]
n. pl., but sing. or pl. in usage 1. physical exercises performed in a sustained and strenuous fashion designed to cause a temporary increase in respiration rate and heart rate, such a running, swimming, walking, or calisthenics. Calisthenic sessions in groups, performed by following a leader in moving to a rhythmic musical accompaniment, are a popular form of aerobics. [ PJC. ]
2. a system of physical conditioning relying largely on aerobics exercises. [ PJC. ]
(adj) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency, Ant. anaerobic, Example:aerobic dance; running is very aerobic