monosemyPronunciation: /ˈmɒnə(ʊ)ˌsiːmi/Definition of monosemy noun [mass noun] Linguistics the property of having only one meaning. Derivatives monosemic adjective monosemous adjective Origin: 1950s: from mono- 'one' + Greek sēma 'sign' + -y3monosemy in other Oxford dictionaries Definition of monosemy in the US English dictionary