micro Syllabification: (mi·cro)Pronunciation: /ˈmīkrō/Definition of micro noun (plural micros) 1short for microcomputer. 2short for microprocessor. adjective [attributive] extremely small:a micro dining area small-scale:CO2 emissions cannot be dealt with at the micro levelOften contrasted with macro.micro in other Oxford dictionaries Definition of micro in the British & World English dictionary