Source : Webster's Revised Unabridged Dictionary (1913)

Aerobic \A`["e]r*o"bic\, a. (Biol.)
   Growing or thriving only in the presence of oxygen; also,
   pertaining to, or induced by, a["e]robies; as, a["e]robic
   fermentation. -- {A`["e]r*o"bic*al*ly}, adv.

Source : WordNet®

aerobic
     adj 1: depending on free oxygen or air; "aerobic fermentation"
            [syn: {aerophilic}, {aerophilous}] [ant: {anaerobic}]
     2: based on or using the principles of aerobics; enhancing
        respiratory and circulatory efficiency; "aerobic dance";
        "running is very aerobic" [ant: {anaerobic}]