kilogram Syllabification: (kil·o·gram)Pronunciation: /ˈkiləˌgram/ (British also kilogramme, abbreviation: kg)Translate kilogram | into French | into German | into Italian | into Spanish Definition of kilogram noun the SI unit of mass, equivalent to the international standard kept at Sèvres near Paris (approximately 2.205 lb). Origin: late 18th century: from French kilogramme (see kilo-, gram1)kilogram in other Oxford dictionaries Definition of kilogram in the British & World English dictionary