dosage /ˈdəʊsɪd͡ʒ/ noun3 •The measured amount so administered or added (the dose), combined with the frequency of administration and the time period for which it is taken.Why did he give you only a single 500 mg dose? The correct dosage of this antibiotic is one 500 mg tablet twice a day for 10 days. •The administration of a medication etc, in a measured amount; dosing. •The addition of a small measured amount of a substance to something, e.g. sugar to wine. formsdosages