aer·o·bic I. \| ̷ ̷( ̷ ̷)|rōbik, -ēk\adjective Etymology:aer- + bi- + -ic 1.: living or active only in the presence of oxygen 2.: taking place in the presence of oxygen : oxidative < aerobic glycolysis > 3.[aerobe + -ic]: of, relating to, or induced by aerobes < aerobic fermentation > • aer·o·bi·cal·ly\-ə̇k(ə)lē, -ēk-, -li\adverb II. adjective : involving, utilizing, or resulting from aerobics < aerobic exercises > < aerobic fitness >