developer Syllabification: (de·vel·op·er)Pronunciation: /diˈveləpər/Translate developer | into French | into German | into Italian | into Spanish Definition of developer noun a person or thing that develops something:a property developer software developers [with adjective] a person who grows or matures at a specified time or rate:I was a slow developer a chemical agent used for treating photographic film to make a visible image. developer in other Oxford dictionaries Definition of developer in the British & World English dictionary