microeconomics Syllabification: (mi·cro·ec·o·nom·ics)Pronunciation: /ˌmīkrōˌekəˈnämiks, -ˌēkə-/Definition of microeconomics noun [treated as singular] the part of economics concerned with single factors and the effects of individual decisions. Derivatives microeconomic adjective microeconomics in other Oxford dictionaries Definition of microeconomics in the British & World English dictionary