mono Syllabification: (mon·o)Pronunciation: /ˈmänō/Translate mono | into German | into Italian | into Spanish Definition of mono adjective 1monophonic. 2monochrome. noun (plural monos) 1a monophonic recording. monophonic reproduction. 2a monochrome picture. monochrome reproduction. 3short for infectious mononucleosis. 4short for monofilament.mono in other Oxford dictionaries Definition of mono in the British & World English dictionary